Unobtainium



""What is that stuff?"

"Its real name is thirty-seven syllables long. I call it unobtainium.""

- The Core

Unobtainium is the exotic metal or other material that is needed to make the Applied Phlebotinum work.

Much mad science uses unobtainium, such as imaginary chemicals with impossible properties or super-strong alloys that cannot be made from common earthly metals. Alien spaceships and weapons are usually made from unobtainium as well.

Some forms of unobtainium are based on real physics, but beyond the current scope of human engineering, such as Room temperature superconductors; they would revolutionize just about every form of technology, but they are not in and of themselves dangerous or based on some exotic physics-bending principle.

Others are more fantastic "high-grade" unobtainium, such as Antimatter, which would be a revolutionary way of storing huge amounts of energy, if it didn't violently undergo mutual annihilation with any conventional matter it came into contact with, including the walls of antimatter storage containers.

The most common varieties of unobtainium in fiction sit somewhere in the middle, like materials so resistant to heat and/or damage as to be Nigh Invulnerable compared to other, similar substances. Materials such as Mithril, adamantium and Orichalcum (and all variant spellings thereof) are the fantasy version. Thunderbolt Iron is especially popular in fiction (and has some basis in reality -- until blast furnaces were invented it was the best source of refined iron).

Following this would be medical and/or chemical wish-fulfillers; Classical real-world alchemy casually referred to carmot, the base substance of the Philosopher's Stone, and Azoth, either the "universal medicine" or "universal solvent". The ancient Greek writer Plato referred to "orichalcum" (Greek for "mountain bronze") in his description of Atlantis.

Increasingly common in Science Fiction in three flavors: whatever stuff makes Faster Than Light Travel possible, closely followed by the stuff that can mess with gravity (if they're not one and the same), and finally the stuff they make Nigh Invulnerable Spaceships and/or Humongous Mecha out of.

The current buzzword in hard sci-fi is Helium-3 -- believed by many to be the catalyst of choice for those nifty fusion reactors that should be perfected any time now. Theoretically, it's a safe large-scale energy source with few environmental side effects. But more importantly, though there's extremely little of it on Earth, there's plenty of it on the Moon.

The term originally comes from aerospace engineering, where it was used to refer to materials that would be perfect for a particular design if not for the inconvenient fact that they were unavailable -- either because they were too expensive, or did not actually exist.

See Also: Minovsky Physics when the Unobtainium has well-thought-out properties that are strictly adhered to, and Green Rocks, which can be thought of as pure unobtainium ore.

Compare Mineral MacGuffin and Spice of Life.

Anime & Manga

 * In Neon Genesis Evangelion they have a special liquid called LCL which has several useful properties. One is its ability to conduct electrical signals, useful for electrically conducting nerve impulses between an Evangelion pilot and his/her Evangelion. But more amazing is its property that it can hold vast amounts of dissolved oxygen at concentrations high enough that once it has filled the lungs, a human can directly breath the oxygen present in it (handy thing when you have to fill a bio-mecha cockpit with this stuff and have the pilot be completely submerged in it).
 * Orichalcum (or a variant spelling) is a metal with magical properties that makes appearances in several anime, including The Slayers.
 * Digimon as a whole has the Chrome Digizoid metal (also spelled ChronDigizoid). It's characterized as a highly sought after super-metal (with a silly name) of any colour which is very strong and cannot be damaged, except by other samples of it; in addition to being mined in some Digimon canons, a small number of Digimon species are either made of/plated in it (e.g. MetalEtemon) or wield weapons made of it (e.g. Zudomon, who killed the aforementioned MetalEtemon in Digimon Adventure). The only time it's been referenced in the anime itself was briefly in the aforementioned Digimon Adventure incident between Zudomon and MetalEtemon, and then only mentioned offhand to give Zudomon, a lower-level Digimon, a way to revenge-kill MetalEtemon; as such, most mentions of the substance occur in the broader source material. According to said source material, there exist several varieties with different properties denoted by specific colours: Blue, which provides high speed (as seen on UlforceV-dramon); Red, which provides even higher defence (e.g. Sleipmon); Gold, which increases a Digimon's offensive power (e.g. Shoutmon DX); and the vaguely described Black (e.g. Craniummon) and Obsidian (e.g. KaiserLeomon).
 * Gundam Wing has the alloy Gundanium, which is incredibly tough, nearly immutable, heat-resistant, electrically neutral, and a natural radar damper. The "rare, hard-to-find" part comes from the fact that it can only be manufactured in space and the fact that at the start of the show, only six people in the world know how to make it.
 * This has some basis in real-world science. The crystalline structures that form as liquid metal solidifies can be very different in microgravity. The odds of creating an alloy with ''all' the aforementioned properties remain fairly small, however.
 * Mazinger Z took the "ridiculously high strength/density ratio" thing to a whole new level when Japanium is alloyed into Super Alloy Z. The titular robot, built from the stuff, stands 18 meters tall, yet weighs a meager 20 tons.
 * Great Mazinger and Venus A are built from the same stuff.
 * And Mazinkaiser.
 * UFO Robo Grendizer gives two examples: Gren, an alien metal Grendizer itself is built with. Since it can not be found on Earth, when Grendizer gets damaged, Alloy Z is used to repair it; and Vegatron, a highly radioactive material only can be mined from planet Vega. The Vegans used it to create powerful weapons, but its overexploitation led to the planet becoming highly unstable.
 * Levistone from Kyouran Kazoku Nikki, a material which makes things hover when electricity runs through it.
 * Code Geass has Sakuradite, previously found and said to be the "Philosopher's Stone" in medieval times, and found in large amounts in Japan. It's now valued as a superconductor, being liquid in room temperature. It also explodes rather easily...
 * Various evolution-inducing stones aside, in one episode of Pokémon Team Rocket had a mecha composed of "polished unobtainium", which made it immune to Psychic attacks.
 * Done with a twist in Laputa where the Levistone (a Grade A Unobtainium) is a well-known mineral (and the name of the material is Etherium instead of Levistone), commonly found in rocks - however, it rapidly decays when exposed to air and thus serves no practical purpose. The movie's Precursors knew how to refine it and fashion it into durable crystals, with many amazing properties. This technology has been lost and the world's nations will now stop at nothing to lay their hands on the few remaining samples.
 * Vision of Escaflowne has 2 of these.
 * One of them is actually called Levistone here. It is heated to decrease its levitation (allowing one to control the height of an airship).
 * The other (and more often refered to) is Drag Energist. It gives life to dragons and sits in their chest cavity where their heart would normally be. It is mined from places where there's lots of dead dragons or from a dragon that is hunted and killed. This mineral is usually pink and it directly creates electrical energy (just makes electricity out of thin air, no input required) needed to power mechs (or guymelefs as they are called in Escaflowne) and other machinery. It also undergoes "resonance" (what seems to more accurately be nuclear fission) if too many are placed together in the same area. This is a real phenomenon called "critical mass". In fact in Escaflowne there is one nuclear accident attributable to this. In one of the last episodes, an atomic bomb is built using this same principle with this material.
 * One Piece
 * Seastone, apparently "a solidified form of the sea". Contact with it will weaken Devil Fruit users, and drain them of their abilities. It's also apparently harder than diamond.
 * Adam, a super-strong type of wood.
 * Don Krieg's armour was made of Wootz steel, a real-world type of unobtanium (see below).
 * Vizorium is both the Unobtainium that makes warp-drive possible, and the central plot driver of the Dirty Pair Movie Project Eden.
 * GEMs in Mai-Otome give Otome their robes (and thus, most of their powers). The Coral and Pearl GEMs used by students are artificially created, but the knowledge of how to create Meister GEMs was lost, making them extremely valuable.
 * Outlaw Star has dragonite, used for Faster Than Light Travel.
 * Bleach has Sekkiseki.
 * Goemon Ishikawa from Lupin III has a katana with a blade made either from a meteor (the manga series) or from a rare alloy that only his clan knows the secrets to making (Dragon of Doom, First Contact).
 * In Claymore swords are made from a rare ore which makes them indestructible.
 * In Dragonball Z, Supreme Kai summons a block of "Kachin", the hardest metal in the universe, to show just how awesome the Z Sword is.  and the metal is never heard of again.
 * In Dragonball Z, Supreme Kai summons a block of "Kachin", the hardest metal in the universe, to show just how awesome the Z Sword is.  and the metal is never heard of again.

Comic Books

 * Naturally, the Marvel Universe has adamantium (in multiple flavors; see below), but it also has other "magic metals," like vibranium (of which there are two varieties, Wakandan [which absorbs kinetic energy/sound/vibrations] and Antarctic [which causes other metals near it to liquefy]), Uru (the material of Thor's hammer), promethium (a magical metal found only in Otherplace/Limbo, which can be used as an energy source, despite it being a real chemical element with real properties), and netheranium (the material of Damien Hellstrom's trident). The best example, though, would have to be the infamous "unstable molecules" used to make so many heroes' and villains' costumes. And Captain America's unobtainable unobtainium shield - completely indestructible, but also a handwavy one-off item.
 * A number of stories suggest that Cap's shield is an otherwise impossible vibrainium/adamantium alloy reinforced by American righteousness (as opposed to self-righteousness). Since the guy making it fell asleep during the forging process, we'll never know.
 * The "vibranium/adamantium alloy" thing is due to a misprint in one of the Official Handbook of the Marvel Universe issues. His shield was made from a unique alloy of iron, Wakandan vibranium, and some unknown contaminant. When the metallurgist who had made it tried recreating the alloy (while Cap was frozen), the closest he could come up with is what's known as (true) adamantium, which is slightly weaker than the alloy in Cap's shield!
 * Speaking of, adamantium comes in a few flavors. True Adamantium is the nearly-indestructible metal alloy that's bonded to the bones and claws of Wolverine. There's also Secondary Adamantium, which is a lot cheaper to make but is still quite strong. Carbonadium (the stuff covering Omega Red's tentacles) is what the Soviets came up with when they tried to create true adamantium; it's about as strong as secondary adamantium, but is more malleable... and radioactive. Also, in the Ultimate Marvel Universe, adamantium can block telepathy.
 * Freakazoid takes a shot at this in "The Island of Dr. Mystico." Freakazoid and a number of superpowered villains are held in a bamboo cage. When Freakazoid tries to bend the bars, Cave Guy says, "It's no use, we've already tried. It's molecular bamboo."
 * The DCU has its own varieties of unobtainium:
 * In the Silver Age DCU, Krypton became a gold mine of unobtainium. Any item, living or not, that originated there would become indestructible under a yellow sun. Kryptonite was also formed by the explosion of Krypton (with various varieties in the Silver and Bronze Ages).
 * Promethium is the DCU's equivalent of adamantium, a super hard metal that superstrong superheroes have a tough time damaging, and Nth Metal, or "transuranic iron ore," was the key to Thanagarian technology (as seen frequently in Justice League).
 * Irritatingly, promethium is a real metal (element 61), one with no stable isotopes and no special structural properties.
 * DC's promethium comes in two flavors. "Raw" promethium can be used as an energy source or a mutagen. When alloyed with titanium and vanadium, it forms a near-invulnerable metal.
 * The first version of the Legion of Super-Heroes used "inertron" for this purpose, an invulnerable metal.
 * The Pre Crisis DCU also featured the invulnerable metals "Supermanium" (a metal once created by Superman) and "Amazonium" (the metal Wonder Woman's bracelets were made from), both invulnerable metals akin to inertron.
 * The Tintin adventure The Shooting Star revolves around a mission to retrieve a sample of unobtainium (dubbed "Phostlite") from a fallen meteorite. The only obvious property of the stuff is making mushrooms grow really fast. And other plants. And animals, like butterflies and spiders. Fortunately, germs don't seem to be included.
 * In Destination Moon, Professor Calculus has invented a new substance - calculon - which can "resist even the highest temperatures", with which to make the nuclear fission motor for the rocket.
 * In an early Marvel/DC crossover featuring the X-Men and the New Teen Titans, the villain Darkseid keeps both teams shackled, and states that Kitty Pryde's shackles are made of a rare metal with molecules so tightly packed, not even she can phase through them.
 * A metal native to the Breakworld in Joss Whedon's Astonishing X Men run adversely affected Kitty Pryde when she phased through it, to the point where she ended up stranded inside a ten-mile long bullet of the stuff when she phased it through the Earth, and wasn't able to control her powers after Magneto rescued her.
 * Epiphyte in The Metabarons, the original source of the Castaka family wealth.
 * Radion in the DCU is incredibly rare. It's also very special because it is the Kryptonite Factor of the New Gods. Even Darkseid can be truly and permanently killed by Radion poisoning

Film

 * Central to the plot of Black Lighting (Chernaya Molniya) is a mystery space element that powers the flying car. The Corrupt Corporate Executive spends the entire movie trying to get his hands on it.
 * Avatar refers to it by name. The movie features a mineral called unobtainium, although, in the film, the unobtainium functions as a Mineral MacGuffin; it's described as a room temperature superconductor that makes space travel more affordable, but never really expanded on apart from that. On the website wiki some of the other uses make it apply to this trope better.
 * According to the guide, it's called "unobtainium" because this is a tongue-in-cheek designation for all high-temperature semiconductor materials, called so by Earth scientists when they gave up on reliably synthesizing them.
 * The Core lampshaded this, calling their Unobtainium Unobtainium, which turned heat and pressure into electrical energy. Perfect for a journey through the Earth's molten core. Extremely practical, as all you had to do was to randomly cut supply wires and casually weld them to the substance in question, and you had an energy source that rivaled a nuclear reactor. There are actually Real Life substances that turn pressure into electricity, known as Piezoelectric substances, although they wouldn't work on such a large scale. One example is quartz crystals (including the one that goes "tick" in your wristwatch). Piezoelectric materials work by flexing, seeing as how the energy has to come from somewhere. This means your core-ship would generate lots of lovely electricity in the process of crumpling into a ball. If a Real Life metallurgist with a sense of humor actually managed to make something that worked as in the movie, they might be sorely tempted to call it "unobtainium" or "impossibilium" or something like that.
 * Metallic tritium serves this function in the second Spider-Man film. The Big Bad has to make a Deal With the Devil (requiring him to beat the protagonist) in order to get some.
 * Strangely enough, the way the Big Bad is going to use the tritium is a scaled-down version of one way physicists are trying to develop fusion power called "inertial confinement". The idea is the same, vaporize an amount of an element with lasers in an attempt to create a miniature sun, only the scale and elements used are different. For more information, this writer's original reference is "Kaku, Michio PHD. Physics of the Impossible. Doubleday Publishing, 2008. Pages 43-45."
 * The "miniature sun" created by inertial confinement wouldn't have a photosphere, prominences, and sunspots like the one in the movie, though.
 * Not only that, the "miniature sun" of inertial confinement would resemble a miniature sun the way an exploding stick of dynamite resembles a burning candle. In other words, there is no resemblance.
 * Parodied in the fifties B-movie homage The Lost Skeleton of Cadavra with Atmospherium, a super-powerful and poorly-defined element capable of operating spacecraft, resurrecting evil skeletons, and delivering actual advances in the field of science.
 * Quantonium in Monsters vs. Aliens. The Big Bad needs it to power his cloning machine so he can execute the Alien Invasion. The only known supply is absorbed into the body of Susan Murphy, who then suffers from some interesting side effects.
 * Fluid Karma in Southland Tales. A compound found by drilling in the ocean that apparently can be used to generate electric power. Also, acts as a drug working somewhat like a Green Rock.
 * Star Trek has red matter, which can make black holes on cue.
 * In Outlander, after establishing that Viking swords aren't strong enough to injure the Moorwen, Kainan salvages some hull metal from his crashed starship, and gives this to the local blacksmith to forge some stronger swords.
 * Turbinium from Total Recall.
 * In District 9, the unnamed nanofluid is found in prawn technology in extremely small amounts, and is apparently quite precious. It has the power to.
 * In Doctor Horrible, the good doctor powers his freeze ray with Wonderflonium, not far removed from Unobtainium as it has the power to stop time. However it only seems to paralyze or turn to stone a single target, rather than actually stopping time itself.
 * Wonderflonium doesn't freeze time as suggested here. It merely makes the impossible possible and powers the freeze ray -- which freezes time -- for a short time, at least. Wonderflonium should also never be bounced for some reason.

Literature

 * Cavorite from H.G. Wells' The First Men in The Moon.
 * Wells also had a previously undiscovered element present in the titular comet in The Day Of The Comet.
 * Harry Harrison's 1973 Golden Age SF spoof novel, Star Smashers of the Galaxy Rangers features Cheddite (a fuel created from cheese). In another scene the heroes' 747 jet is turned into a spacecraft by means of windows armored with armolite, vacuum insulation with insulite, fuel tanks filled with combustite, guns firing pellets of destructite, batteries replaced with capacitite and a space-warp drive powered by warpite.
 * Melange, also called spice, in the Dune novels, extends life and grants limited prescience, allowing Faster Than Light Travel. And it tastes like cinnamon. Oh, and there are other uses. If it seems like something that would be extremely valuable and important, that's because it is. It's generally thought to be an Alternate Company Equivalent to oil in the way that it drives the greater economy and is controlled by warlike tribes.
 * Iridium, a natural element that is extremely rare on Earth, is often used in more dramatic Sci Fi stories.
 * The German SF/pulp series Perry Rhodan has over the course of its history collected a fair bit of unobtainium in various forms. Classic examples are Ynkelonium, a metallic element that does not react with antimatter and can to an extent prevent such reactions from occurring in its immediate vicinity, and Luurs-Metal, which always maintains a constant temperature of about 3.4 degrees Celsius. Both materials occur naturally in the universe and cannot be synthesized.
 * That's only two of the many examples, the series frequently introducing new and exotic materials, practically whenever a new alien species is encountered. The wiki for the series alone consists of at least 150 entries for exotic materials and is by no means complete.
 * Mithril in The Lord of the Rings, an incredibly strong and silvery metal mined by dwarves.
 * Larry Niven's Ring World has a few examples:
 * Scrith, the material used to make the titular megastructure. It is nearly frictionless, blocks almost all radiation (which would take about a light-year thickness of lead) and has a tensile strength on the same order of magnitude as the strong nuclear force.
 * The unnamed substance the Puppeteers make General Products hulls out of. They're actually massive molecules big enough to live in.
 * In the Star Wars universe we have bacta, tibanna gas, transparisteel and durasteel (which itself is an alloy of carvanium, lommite, carbon, meleenium, neutronium, and zersium)... Well, let's say there are lots of interesting materials and substances in the Star Wars EU. Special mention goes to cortosis, which is lightsaber-resistant. Or in its purest form actually causes lightsabers to short out.
 * In Stationery Voyagers, both Mechies and spaceships can use lead-balzhite for fuel. Lead is obviously a stabilizer; but the balzhite part is never explained. What matters is that only Stationeries have learned how to create it and harness it.
 * The Uplift Series by David Brin has a material of the name unobtainium.
 * The hyperdrive of Kevin J. Anderson's The Saga of Seven Suns is fuelled by "ekti," described as "an allotropic isotope of hydrogen."
 * Atium, from the Mistborn books. It's only mined in one place, it's extremely rare, and incredibly powerful. All of the properties of Atium are ultimately justified by it being.
 * John Ringo's Looking Glass series is so named for the instantaneous transmission portals which were created by what were originally thought to be Higgs bosons. That identification was later corrected, and they were renamed Looking Glass Bosons. The looking glasses of the first book take a secondary role however, after the series takes off into space in a ship powered by a Black Box of alien origin,  This leads to the fourth book where the captain of the ship discovers he is missing a large number of alien made spare parts and lampshades all of this saying, "And now I have to call SpaceCom and explain to them that we're non-mission-capable until a couple of tons of unobtainium parts and tools get found!"
 * Practically every book in the old Danny Dunn children's scifi series starts out with the discovery of a new form of Unobtainium. Usually because Danny or a friend of his spilled something in the lab.
 * Tanglestone from the Elizabeth Bear book, Undertow, was only found on the planet named Greene's World, and allowed instant data and material transportation across many light years from the colonies to Earth.
 * In Tamora Pierce's Circle of Magic and The Circle Opens series, there's living metal, which can only be gotten by one character, because it grows on her hand due to an accident involving fire and a staff with a metal top. Later she can make it faster by putting some in a jar and adding some of her blood to it, but she is still the only person who can make it, and thus the only one with consistent access to it.
 * Rudyard Kipling's story The Night Mail has airships lifted by "Fleury's gas" energized by "Fleury's ray." The lifting power of the gas can apparently be rapidly adjusted, and is so great that airships are made rigid enough to achieve speeds of two hundred miles per hour without straining the hull or engines. (No real-world airship has ever reached one hundred.)
 * In Ayn Rand's Atlas Shrugged, industrialist Henry Rearden is introduced as a protagonist by way of his invention of "Rearden Metal," a somewhat vaguely-described alloy of steel and copper which is much stronger and cheaper to produce than industrial-grade steel.
 * Neal Stephenson's The Baroque Cycle gives us the Solomonic gold, and Stephenson also goes into a long digression on wootz steel, which is actually real and pretty damn awesome to boot.
 * Neal Stephenson's Anathem has a material called New Matter that has drastically different properties than regular matter.
 * It is explicitly stated that it is an alternative chemistry created by rearanging subatomic particles. This is based on Real Life physics with Exotic Matter.
 * EE Doc Smith's Skylark Series features several nonexistent wonder-metals, including Arenak for super-tough armor, and Metal X which can convert matter completely into energy when exposed to X-rays.
 * Humanity's escape from the doomed planet earth in When Worlds Collide by Philip Wylie and Edwin Balmer is finally made possible when tides from the approaching planet tear open the earth, revealing the previously hypothetical wonder-metal needed for nuclear-powered space travel.
 * Wil Mc Carthy's Queendom of Sol series has quantum dots, which can imitate the properties of ordinary matter as well as manifesting exotic attributes like perfect reflectivity and frictionlessness. He also wrote a non-fiction novel called Hacking Matter that talks about the real-world possibility of using them. So, unobtainium today, but maybe not tomorrow.
 * Discworld subverts this trope with octiron, a fantastic metal that's really only useful as a substitute for spherical worlds' compass magnets (it points to the Hub). Played straight with sapient pearwood, which is to blame for the Luggage's animation and magical properties.
 * Neal Asher's Polity Series has Chainglass, a material made from silicon chain molecules that can be made near-indestructible and sharp enough to slice through steel with ease. Chainglass is used instead of metal and plastic in most applications. It also made the inventor the richest man in the galaxy.
 * Urim in L. Jagi Lamplighter's Prosperos Daughter trilogy. Warrior angels wear it. It can hold the Water of Life. A gauntlet made of Urim allows the wielding of the Staff of Decay without harm.
 * The Sten series has Anti-Matter Two, the only energy source capable of generating enough power to run hyperspace engines and make interstellar travel feasible. In all the Universe there is only a single source of AM2, and only the Eternal Emperor knows where it is.
 * In Stainless Steel Rat Goes to Heaven, common coal have rare "slow" and "fast" coal that slow or speed up time inside it. The Big Bad had.
 * Animorphs made a brief mention of ramonite, the metal that makes up most spacecraft and gives it its properties of stretching open doorways and opaquing/clearing the viewports.
 * In Raise the Titanic by Clive Cussler, the US hatches a military plan requiring ultra-rare byzanium. The only known deposit, on a remote Russian Arctic island, had been mined out in the early 20th century, and the entire output shipped out on an ocean liner to the United States. Guess which one.

Live Action TV

 * Doctor Who - Dalek cases are made of Dalekanium, which makes them Immune to Bullets, although recent episodes showed that they now use a Deflector Shields variant to vaporize bullets before they even reach the case.
 * Dalekanium is often called 'bonded polycarbide' when they want it to sound less silly.
 * Which basically means plastic. Specifically Kevlar.
 * In Stargate SG-1 and Stargate Atlantis, naquahdah is material the Gate is made of. Also, naquadah-enhanced nukes are used to Blow Stuff Up. This is demonstrated magnificently in the season 3 finale of Stargate Atlantis. Its evil twin is naquadriah, which can also be used to Blow Stuff Up, but is "unstable" and has a track record of blowing up its users. The iris on Earth's Stargate is made of a trinium-titanium alloy. Human-form replicators apparently can only be made from neutronium.
 * Naquadah is also a powerful source of energy (naquadah reactors). Also ZPMs could be seen as a sort of unobtainium given that no one knows how to make them and they're needed to run all the Ancient technology in the series (as well as providing a convenient bit of Tim Taylor Technology to the human ships)
 * Naquadriah also indirectly plays the Unobtainium role in Stargate Universe as the only known power source that can support a wormhole between the Milky Way and Destiny. Only problem is that it takes a planet full of the stuff to do it, and that planet tends to blow up in the process.
 * The whole of Star Trek is liberally sprinkled with various types and grades of unobtainium; the original (and most frequently recurring) example is dilithium, used in the reactor core of warp drives as a control medium, but there are many others:
 * Corbomite, which doesn't actually exist; it was an Ass Pull by James T. Kirk to bluff an enemy -- which means that Trek pulled a Lampshade Hanging on their own tendency to invoke unobtainium in one of its earliest episodes.
 * Neutronium. This is a real substance: a type of "degenerate matter" composed entirely of neutrons, thought to be what neutron stars are made of -- but since even a thimbleful would weigh millions of tons, its usefulness as a material is rather limited.
 * This doesn't stop assorted aliens from constructing easily opened doors, buildings on planetary gravity, entire starships and a freaking Dyson Sphere out of the stuff.
 * Astrophysicists rarely if ever use the word "neutronium" for this stuff, preferring terms like neutron-degenerate matter, and that that neutron star matter would not be stable without the extreme pressures of a neutron star in the first place anyway, i.e. it would instantly explode producing extremely intense neutron radiation.
 * Duranium, Tritanium, Baakonite
 * Latinum, a valuable liquid metal, used as a form of hard currency due to its rarity and the fact that replicator technology cannot recreate it.
 * Trilithium, less stable than dilithium, but equally magical.
 * Keiyurium, a Shout Out to the original Dirty Pair.
 * Vertenium-Cortenide, a compound of two non-existent substances, used in the warp coils themselves.
 * Archerite, another Ass Pull, this time by the Andorian Shran when explaining to another alien commander what he was doing in their territory.
 * Transparent aluminum. which gets bonus points, given that a normal modern chemist could apparently figure out what it was just by looking at the atomic structure. Naturally, he would still be helpless to reproduce it without a diagram of said structure.
 * Transparent aluminum exists now. See here
 * Aluminum Oxynitride is a ceramic, however. Transparent aluminum metal remains unobtainium.
 * Cortenide, which comprises Data's skull with duranium, as he describes to a Klingon warrior who almost knocked himself out headbutting him.
 * Trellium-D formed a major Mineral MacGuffin for the third season of Star Trek Enterprise, which has the ability to negate the random anomalies that existed in the Expanse. Interestingly, there appeared to be a sub-science developed around the item, with a method of synthesizing the stuff.
 * At one point in Star Trek Voyager when aliens try to kidnap Paris for the that has been implanted in his brain, Janeway mentions that they packed the shuttle he was captured in with fulmorite explosives.
 * Both versions of Battlestar Galactica relied on a fictional element called "tylium" to power their FTL drives.
 * And an episode of Star Trek Voyager had an alien species using the same exact fuel by name!
 * In Power Rangers Time Force, Trizirium Crystals are an very powerful energy source that originally won't be discovered about 200 years from 2001, because of the battles between the Time Force Rangers and Ransik, as well as Bio-Lab trying to reverse-engineer the future tech the early discovery.
 * Power Rangers RPM has flux overthrusters needed to handle advanced zord control stuff. The first one was lost in the wastelands after the plane it was installed in was shot down. The second...well, it's lucky that that's when the bad guys sent a bot capable of Power Copying.
 * The jumpgates and jumpdrives of Babylon 5 relied on an exotic and extremely rare mineral called Quantium-40 to function.
 * In Knight Rider (the original series), KITT was built out of a material called either Tri-Helical MBS (Commonly referred to as a "Molecular-Bonded Shell") or Plasteel 1000, which rendered the car almost indestructible.
 * In the TV series of Honey I Shrunk the Kids, it's revealed that an element Wayne named "Szalinskium" is at the core of all his impossible inventions. In another episode it's revealed that.
 * In a two-part episode of the Lynda Carter TV adaptation of Wonder Woman, we learn that her indestructable bullet-deflecting bracelets are made of "Feminum." (This is in contrast with the Comic Book canon, which at the time held that her bracelets were made of "Amazonium.")

Myth and Legend

 * The oldest example would be Orichalcum (Orichalc, orichalcos) which is part of the Atlantis myth - Plato describes it as somewhat reddish, shiny, and hard, and usable both as armor and art. Conspiracy buffs identify it with an alloy of gold and copper from South America that does, in fact, have these properties.
 * Adamant, which has a legendary hardness dating back centuries, being an older name for diamond. Unfortunately, it also shares a name with an adjective, and so tends to be saddled with suffixes. Look for Adamantine, or for that Sci Fi twist, Adamantium. If you ever have the misfortune to see Adamanite, look away.
 * The entire premise of ancient and medieval Alchemy was based on the pseudo-scientific search for Unobtainium ("philosopher's stone" or "quintessence"), usually described as a material which would catalyze the manufacture of gold from base metals.

Tabletop RPG

 * Shadowrun, true to its fantasy-scifi-blend form, borrows from myths for its Unobtainium, such as orichalcum, an alloy of copper, gold, silver, and mercury that couldn't even begin to exist if there wasn't magic in the world.
 * In Warhammer 40000, almost every race has a form of this, from the psychic wraith bone to the ubiquitous armour plate the humans use on tanks, adamantium. Adamantium's properties are never really explained, though, in the books, it seems to suffer from a mineral variation of The Worf Effect ("How could they cut through X many feet of adamantium that easily?!"); another worf effect example is the material used in Space Marine power armour, Ceramite (often such examples involve either cutting blades, or melta/heat weapons as ceramite is reckoned to be extremely resistant to heat). This also happens a lot with human building materials in that universe, all of which have odd but recognizable names and are supposedly better than what we have now, but which can be reduced to rubble in the first bombardment.
 * The technology levels in the setting also cause some rather strange applications for the unobtainium, such as adamantium bayonets fitted to the lasguns of the Imperial Guard.
 * In Warhammer (fantasy setting of 40000), glowing green 'warpstone' is used to create mutations, enhance magical powers, bring the dead to life, and as an energy source for powerful technology. In the Skaven rat-men society, it is even used as currency. Warpstone is considered rare, and is mined and collected by nearly all factions in the Warhammer setting.
 * That's not quite right. Warp energy spewing out of the Old Ones' polar gates blows across the world, refracting into the eight colours (winds) of magic. The unrefracted leftovers (dark magic) settle in areas of evil and death, congealing into warpstone over time. The Warhammer world also has a moon composed entirely of warpstone, Morrslieb, which rains warpstone meteor showers on occasion. Warpstone is also not collected by any faction except the evil ones, most notably the Skaven.
 * Dungeons and Dragons has mithril, adamantine, orichalchum, AND the Philosopher's Stone. Unobtainium overload... and that's the tip of the iceberg.
 * Eberron has Dragonshards, Khyber Dragonshards, Siberys Dragonshards, Star Metal, Baatorian Steel, Residuum, Arcanite, Byeshk, Ironwood, Bronzewood, Densewood, Soarwood & Riedran Crysteel. Unobtainium overload indeed.
 * Red steel, cinnabril, and related substances from the "Red Steel" region of Mystara.
 * Bloodsilver from the Birthright setting.
 * Exalted features the five magical materials, Orichalcum, Moonsilver, Starmetal, some variants of Jade and Soulsteel. All of these are extremely difficult to obtain and work: Orichalcum only forms when gold touches magma and has to be worked in a lava floe while sunlight streams onto the forge, Moonsilver only forms in the Wyld, where reality is breaking down, Starmetal is made from dead gods and, while working it is theoretically as simple as iron, Fate conspires to make the manufacturing process go wrong in ten thousand little ways, Soulsteel is made from ore from the Labyrinth (under the Underworld) and ghosts, Jade requires hazardous chemicals to work and is used as a currency, admittedly an extremely high-value one. There is even an Unobtainium version of Jade - in rare and unrepeatable alchemical accidents Jade (most normally a mixture of white and green Jade) can be turned into Yellow Jade which is possibly the most coveted magical material out there.
 * With the release of the Alchemical sourcebook, there now exists a sixth basic magical material as well: Adamant. It is extremely rare in the main world of Creation, and only slightly more commonly found in the machine-body world of the Primordial Autochthon. To quote the sourcebook, "Adamant is composed of super-dense, electric-blue diamonds that form in yard-long rod-like masses with smaller crystals growing off larger ones. They can be found in areas that are under enormous pressure and are scorchingly hot. Mining for adamant is impossible without protective gear, even for Exalts, and special tools must be used to cut the crystalline rods free so that they can be taken back to a city and refined into useable forms." Though it is a crystal, rather than a metal or stone like the other materials, it is used in the forging of magic weapons and armor in an identical way to the others.
 * Solars. One of the reasons that Solar technology is unsustainable by anybody else is due to their Wyld Shaping powers. When Solars need a material with properties relevent to the artifact or Magitech they are building, they just go out into the Wyld and conjure it up, regardless of how impossible its existence would otherwise be.
 * The "Perfected Metals" of Mage: The Awakening. They have numerous extremely useful properties (perfected iron, for example, is practically indestructible, capable of cutting through diamond when properly sharpened, and can bend like rubber before returning to its original shape, with absolutely no metal fatigue), and can be used to create all manner of useful alloys (such as the anti-magic "thaumium"). There are only seven of them (only alchemical metals can be perfected), and it takes powerful magic to perfect them and alloy them. Perfecting is also a very expensive process, since it requires only naturally formed samples of metal (rather than transmuted or conjured) and only 10% of the mass yields perfected metal, with the rest being completely lost (hence, you perfect 100 grams of metal and only get 10 grams of perfected metal, with the remainder destroyed).
 * As well as the lanthanum used in jump drive technology, Traveller features so many varieties of Unobtainium that the latest edition lampshades it by including "unobtainium" as a trade good.
 * Ghost Rock, which burns twice as long and twice as hot as coal, is used for all the weird high tech stuff from Deadlands and somehow stopped the collapse of the Confederacy. Oh, and it looks like coal that has had tortured human faces into it, and it moans faintly when burned.
 * The various essential elements from GURPS: Magic as well as orichalcum and adamantium in Fantasy and hyperdense matter in Ultra-Tech.
 * Although it's a tabletop war game rather than a tabletop RPG, Steve Jackson Games' Ogre features combat units protected by Biphase Carbide armor. This makes them tough enough to withstand anything short of a direct hit from a nuclear weapon.
 * Talislanta has a number of forms of Unobtainium, some based on historical alchemy and others made up for the setting, and fairly thorough rules for crafting and utilizing them.
 * In the boardgame Nexus Ops (originally by Avalon Hill, recently re-released by Fantasy Flight Games), the corporations fight for control of a mineral called Rubium. Nothing more is known about it from the manual, but it seems that some indigenous species on the planet it is mined on are linked to the mineral in some way as there is a creature called the "Rubium Dragon" which is also the most powerful unit in the game.

Toys

 * The Transformers franchise is a pretty good place to mine for Unobtainium, Energon being the most frequent and the best example: Transformers need it to live, but too much unstable Energon radiation can cause shorting out. It's also highly volatile when stored in most environments (and likely to explode if dropped or fired upon), and other properties too bizarre and diverse to list. Other Unobtainium-like materials include...
 * Electrum (A real substance, actually, but given fictional properties)
 * Furmanite (Obscure, used only in one Botcon-exclusive comic)
 * Nucleon (Though used as an Energon substitute, it causes bizarre reactions in a Transformer's "biology", most notably the loss of transformation ability.)
 * Cybertonium (Never thoroughly explained, though it breaks down more rapidly in Earth's atmosphere than other Cybertronian minerals. Loss of this substance is serious for Transformers built on Cybertron. Like Energon, it can also be processed and stored in cubes.)
 * Destronium
 * Bionicle's Matoran world has protodermis (often shortened to just "proto" by the fans), which admittedly isn't really rare because it makes up everything in that world: the water is made of liquid proto, rocks and metal ore are solid proto, and proto even makes up the organic tissues of living beings. Truer examples of Unobtainium that really are hard to obtain include a super-hard variant of metal protodermis called "protosteel" and "energized protodermis": an un-synthesizable liquid that either unpredictably transforms anything it touches or destroys it. Oh, and it turns out energized proto is alive, too.
 * Another world, Bara Magna, has its own Unobtainium called Exsidian, though unlike protodermis it doesn't have any special properties beyond better resistance to wear and tear.

Video Games
""It's how they choose their king. Like I said, idiots.""
 * Eve Online has a player economy built around mining for a rather long list of made up materials. And the rarer types are very hard to get. Bonus points for using "Tritanium", which is the most sought after element in high security space.
 * However, most of the asteroids that refined minerals come from are made up of either real-world minerals (such as veldspar and gneiss) or slightly renamed versions of real minerals (like hemorphite and hedbergite).
 * Excelsior Phase One Lysandia: Many powerful weapons and armor are forged from Eramel, which, oddly, is only mined in a tower.
 * Two kinds of unobtainium are mentioned in the game manuals of the Halo series:
 * An "unknown alloy" (read as: the writers couldn't think of a cool name) used to make the shields of the Hunters and the armor plating of Covenant warships.
 * The impressively resistant construction material used to make the Halos and other Forerunner structures, described as being incredibly dense and accurately carved to the molecule. The author of this article from Gamasutra, a PhD., goes to the trouble of calculating just how much unobtainium would be needed to build the Halo, plus other stats you never knew you wanted to know.
 * Various one-off missions in the MMORPG City of Heroes had the player retrieve various Mac Guffins, including one actually called Inobtainium. Fittingly enough, it's an alloy of Yeahritium and Nosuchium.
 * Played more straight in the game is Impervium, a metal found as a rare form of salvage (Enchanted Impervium is one of the most valuable drops), which the Vanguard soldiers are said in their profiles to be armored with.
 * Orichalcum shows up too, also as a salvage material for crafting.
 * A recurring element in the Mega Man series is a metal called "Ceratanium" (in the original Japanese, simply "Ceramic Titanium"). Its exact properties are unknown, but it seems to be involved in making all the Mega Mans' armor, and in Mega Man Zero 4, where you can collect parts and get the engineer to make body armor out of them, the Ceratanium is found once in a fixed spot each stage and goes exactly once into each piece of body armor you can make.
 * There's also officially "Bassnium," the power supply Wily says he used to make Bass, which is a bit silly.
 * In the Japanese version, it has the much less silly-sounding name "Fortenium". However, since Wily himself discovered the element while designing Bass/Forte, it's not out of character for him to give it a silly name just to match his robot.
 * As well as the metal given the Fan Nickname 'Mettanium', used to make the Met/Mettaurs/Methats that are so iconic in the series. One fan explanation for it not being used in every robot Wily makes is the fact that it's Unobtainium - or at least rare enough that only small objects can be created with it at a time.
 * Orichalcum, seen elsewhere in this article, also turned up in Indiana Jones and The Fate of Atlantis as a power source for the machines of Atlantis and potentially other machines as well. Which is why Indy had to stop the Nazis from getting to it first.
 * It also shows up in various Harvest Moon titles (usually used to make gift jewelry). They also feature Mystrle and Mythic Ore - used to give tools semi-magical properties.
 * And plain ol' Mythril in Harvest Moon's spin-off title 'Rune Factory'.
 * Command and Conquer and its sequels feature Tiberium, an apparently plant-like (in growth patterns and behaviour) but actually crystalline substance of extraterrestrial origin, as a harvestable resource and Global Currency. Its name derives from where it was first encountered - the impact site of the meteor that carried it to Earth at the Tiber River - ergo, it was called Tiberium. It's also terribly, terribly toxic, potentially radioactive (depending on what it leeches or assimilates) and generally so dangerous that it explodes violently if processed properly or stored in large enough quantities.
 * It's apparently a crystal that leeches various elements out of anything it touches, and makes more of itself. Certain materials are more resistant to being turned into Green Rocks, but all of them degrade eventually. With flesh, crystallization happens almost instantly...
 * Nevermind the fact there's blue (canonical) and red/orange (semi-canonical) variants that are Made of Explodium - as if the green stuff didn't explode enough to begin with. With a bit of SCIENCE, you can turn tiberium (or tiberium-related substances, such as tiberium veins) into a chemical weapon that puts some of the deadliest stuff today to shame, or an explosive that makes a heavy-duty fuel air bomb look like a firecracker.
 * Makes a lot more fictional sense if you know that C&C was itself based on the RTS game Dune II, which had you harvesting spice out of the ground.
 * Cleria, Emelas, etc. in the Ys series.
 * Starcraft, likewise, had "minerals" of an unspecified type and "Vespene Gas" (which you require more of, by the way), which each of the playable races uses in a different way to produce its various units and buildings.
 * Neosteel, the material of Terran construction, is another example.
 * Also, the Khaydarin Crystals.
 * The first two games of the X-COM series had Elerium, an element that formed in yellow crystals and had an atomic number of 115 (such an element has been actually created already). Since the third game, Elerium could be mined on Mars and extrasolar colonies.
 * The second game reveals that Elerium-115 becomes inert if submerged in salt-water for too long, and since X-COM 2 is titled "Terror from the Deep", that's a bit of a problem. The new source of power is Zrbite - apparently, an artificial material created through molecular manipulation. Following the victory in X-COM 2, however, the aliens' Molecular Manipulation network collapses, and all remaining Zrbite becomes inert. It maintains its Unobtainium status, however, and Inert Zrbite is later used to build FTL-drive engines (with Elerium-115 as fuel).
 * Kingdom Hearts requires the player to collect various exotic metals and crystals such as mythril, orichalcum, lightning stones, power crystals, and serenity gems in order to create items, eventually including the most powerful weapon in the game.
 * Minecraft gives us redstone, a nice little powder that can conduct electricity and can be used to open doors, power minecarts, make music, ect. Although it actually is pretty common below certain depths.
 * The unminable bedrock is sometimes referred to as Unobtanium.
 * This is probably the most accurate use of the name, since, without the use of cheats, you cannot obtain it.
 * World of Warcraft has frightening amounts of Unobtainium, starting out around the time the player starts mining Mithril ore, proceeding through Truesilver, Arcanite, Fel Iron, Adamantium and finally Khorium and Eternium. To quote a recent Penny Arcade post on the subject, "What's next? Awesomite?"
 * There's also the equally-mundane Titanium, its enchanted cousin Titansteel, and the more fantastic Saronite. This contains or possibly is entirely the blood of the Eldritch Abomination Yog-Saron, God of Death, drives people who mine it mad, and naturally forms into the shape of skulls when smelted. And which for some inexplicable reason, people decided to make armor out of and wear. Yeah, sticking that on your head couldn't possibly go bad.
 * World of Warcraft is also littered with mundanely-named minerals that possess properties far greater than their real-life counterparts.
 * Engineers, Jewelcrafers, and Blacksmiths use Thorium (a radioactive metal used in some reactors as a replacement for uranium and of which powdered form has been known to spontaneously combust in the air... dust which would be prolific around any thorium mining, smelting or forging site... and causing liver damage if absorbed in the body pre-combustion) and later on Cobalt (which gives off toxic, arsenic containing fumes when smelted, is an active nutrient for bacteria, is the third highest rated metal for causing contact dermatitis, and can lead to cardiomyopathy or cobalt poisoning if too much is absorbed into the body from breathing or consuming cobalt dust or powder... which would be produced, as with thorium, by the mining, smelting, and forging process). And while these are real elements, the apparent ease and safety with which they can be mined, smelted, and forged adds an Unobtanium aspect to them. And we won't even start on mercury being as harmless as water in the Deepholm zone, with one quest even requiring you swim in a lake of it. Considering the average character's Power Level is way Over Nine Thousand by the time they get to Deepholm, plain old mercury shouldn't be a problem.
 * All of that aside, a plot version exists called Kaja'mite. A rare mineral only found on two islands that we know of, its presence gave the goblins super-intelligence. When supplies ran out, their intellects gradually went into decline and they spread out across the world as traders in hopes of finding new sources.
 * Mass Effect also has its own form of Unobtainium, better known as Element Zero or "eezo" in the Mass Effect 'verse. This material is responsible for all of the technology in-game, as it has the ability to manipulate mass, which makes it valuable for propulsion systems, projectile weapons, kinetic force fields, artificial gravity, and a powerful, convenient method of Faster Than Light travel. Indeed, "eezo" is a key element of virtually every advanced galactic technology.
 * The "biotic powers" in the game come from being exposed in the womb to Element Zero. But if it doesn't work, it usually gives the fetus fatal cancer. Plus, the computer hardware that makes biotics useful in combat has some serious side effects, everything from nosebleeds, to occasional migraine headaches, to full-on insanity.
 * As the title quote notes, bad guys make Element Zero into a drug called "Red Sand." It's like cocaine, but it gives you limited biotic powers. Oh, and it's highly addictive, and addicts who can't pay for their habit are sometimes sold into slavery.
 * The Final Fantasy series is also known to have various forms of Unobtainium, such as orichalcum or adamantite. In fact, every RPG ever made by Square Enix has something like that, often in the same relation as the Kingdom Hearts example.
 * Final Fantasy Tactics a 2 lives this trope to the full! Not only has it scores of metallic unobtainium, but also plenty of both chitinous (bones) and dendritious (wood).
 * The Crusader games had two.
 * Di-corellium, a mineral that is apparently better for use in nuclear reactors than plutonium--to the point that it almost became a metaphor for petroleum, and at the very least for energy crises in general, what with the increasing scarcity of it and power shortages on Earth because of it--and of which vast quantities, about half of all known reserves, are on the moon.
 * Polonium--yes, ''that' polonium--an element than in real life is unstable, highly radioactive, and extremely toxic, is used as...body armor.
 * The Metroid Prime games feature Phazon, which is a highly-mutagenic, violently unstable, sentient mineral. Being a bit more specific, there is an incredibly resistant metal made from it known as Phazite.
 * In addition, visor scans can identify the chemical properties of certain structures. When you see names such as "Talloric Alloy" and "Bendenzium" in the description of a destructible obstacle, it is usually an indication as to which weapon you will need to use to proceed.
 * Dwarf Fortress has a rather extensive simulation of real-world geology and metallurgy, including creating simple alloys such as bronze and electrum. It also has Adamantine, an incredibly rare ore that can be processed into various forms that allow it to be used in almost any type of construction imaginable - weapons, armour, tools, clothing, furniture, building material... about the only things you can't make out of it (well, without modding) are beds and food.
 * There's also slade, which can't be dug out. Even if you could, it's horrendously heavy, so the potential uses for it are very limited -- not that it matters, as the game won't let you use it even if you somehow get some out of the walls. You're not thinking about this, though, because if you've even seen slade, you've got other problems to worry about.
 * Now the developer is planning for game world's to each have their own unique Unobtainium with each one making some rare materials with randomly generated properties. When he first tried it out, he expected metals but ended up getting cursed mist.
 * The Myst series has the artificial stones nara and deretheni. There is also a tawny stone found on Riven, used for ornamental purposes.
 * The X-Universe has Nividium, an evident pun to Nvidia.
 * This is brought up on the forums quite often, and Word of God says No, although this may be due to wanting to appear impartial and not wanting to alienate ATI/AMD.
 * Also in this category is teladianium, a ceramic mainly used for structural components.
 * Spice in Spore, as a reference to Dune. It can be used for anything - it's a food, dietary supplement, fuel source, cleaning product, narcotic...
 * Parodied in the Ratchet and Clank Games, where the material Raritanium is really rare and useless (in part one) or easy to get and used to purchase spaceship upgrades (in part two)...
 * The Null Fragments in zOMG!, when in use, were like this. These little purple gems could be used to make anything you could think of, from tattoos, to figurines, to feather boas, to the armor of an alien species, to... you get the idea.
 * The browser game Skyrates includes Unobtainium (in fact, portrayed as Green Rocks ) as a trade good, and is also used in role play and player discussion as a reasoning for hard to explain occurrences, jokingly or otherwise.
 * A little-known RTS called Submarine Titans has "Corium-296"... which appears to suggest that it is an extremely heavy element. Corium is very important to achieving the advanced technologies in the game, but is not naturally found on Earth: the enormous comet that forced humanity under the seas was made of the stuff, and small deposits (fragments of the comet) are found all over the place.
 * In The Legend of Zelda Phantom Hourglass, you need the three pure metals (each corresponding to one of the creator godesses) to create a blade that turns the titular hourglas into the Phantom Sword. It's required by the plot, since the Phantom sword is the only thing that can hurt Bellum.
 * The names of the Pure Metals are dirived from their color: Crimsonine, Azurine, and Aquanine.
 * Psitanium from Psychonauts. High grade unobtainium - a meteorite that grants anything alive psychic powers and is the plot device for any number of absurd things in the game.
 * In Golden Sun, there are nine forgeable materials: in increasing order of power, Tear Stone, Star Dust, Sylph Feather, Dragon Skin, Salamander Tail, Golem Core, Mythril Silver, Dark Matter and Orihalcon.
 * Master of Orion 2 invokes this trope in the form of Xentronium. It cannot be invented by the player and must instead be plundered from the Antarans, either by capturing and reverse engineering one of their warships or by defeating the Orion Guardian (both very difficult to pull off, and each only gives you a ~30% chance of acquiring the technology). If you're successful, you're rewarded with the best armor plating in existence (Xentronium edges out the best player-researchable armor by a 5:4 factor).
 * The MOO series also contains many other substances such as Tritanium, Zortrium, Uridium and Adamantium. Due to the way research works, any of these can be Unobtainium in a given game.
 * Snoopy vs The Red Baron for the Playstation Portable does this bald-facedly. In order to make a superweapon called the Doodlebug, the Red Baron needs, what else? "Unobtainium." Subtle.
 * Half Life's Xenium: if you focus a particle beam on a pure crystal, it can rip through dimensions. And it can't be found on Earth but is an essential component to human-made teleporters.
 * Or that blue-ish metal Combine tech is made of. Whatever it is, it can't be scratched by anti-tank rocket impacts and reflects tau particle beams. Also, dark energy was the universe's scientific Unobtainium just like in real life - until the Combine came; the Citadel's central reactor is an inexhaustible supply of the stuff. It is used to generate plasma made of exotic matter which is the basis of all Combine tech.
 * The instruction manual for Supreme Commander 2 explicitly mentions that the humongous mecha King Kriptor is unobtainium-armored.
 * Runescape features many odd metals, including Mithril and Adamantite. It also features "Runite" as a metal. Then there's the "Dragon" metal, which unlike the others, cannot be mined anywhere, nor can it be forged. Weapons made of Dragon metal can be obtained through drops, but not made.
 * In Original War a recently discovered material known as Siberite, or Alaskite, depending on timeline, is an efficient energy source, can be used as a nuclear weapon and can power up a time machine.
 * Australium in the backstory of Team Fortress 2, a material so powerful and versatile that it has granted the rather dim-witted Australians global technological supremecy. Shipped in bars marked with a picture of a man fighting a kangaroo.


 * It also has the side effect of causing Testosterone Poisoning to those who handle it, turning anyone using into ridiculously manly Boisterous Bruisers with Badass Mustaches and Carpets Of Virility.
 * The Phantasy Star series has laconia, a metal similar to silver in appearance that is found on the planet Dezoris; it is often refined and crafted into some of the best gear available in the series.
 * Sam & Max approach a mine tunnel in Beyond The Alley of the Dolls: "Maybe there's gold down this tunnel! Or rare deposits of Cantgetium!"
 * Would ADAM from Bio Shock count? The substance that is in great demand and practically the substance that runs the city of Rapture?
 * The Perils of Akumos offers us naxonite and peryolitium, which are particularly hard to find considering that you're supposed to be near mines of them.
 * In The Elder Scrolls, various types of unobtainium are used for armor and weapons.
 * As seen in Morrowind, the confusingly named ebony and glass are volcanic minerals. Daedric armor is forged from magicked ebony.
 * In the Shivering Isles Expansion Pack to Oblivion the smiths in New Sheoth can forge armor and weapons from amber and madness ore. (Lord only knows what the latter comes from.)
 * Skyrim reveals that orcish and elven armor are partially forged from orichalcum and quicksilver, respectively.
 * Dwarven metal is an interesting case, as it's unobtainium In Universe: in-game books in Skyrim reveal that mages, smiths, and scholars have tried for years to imitate its properties, with no success. Apparently the Dwemer were just that advanced in metallurgy. The only reliable source is recycled scrap metal from Dwemer ruins.
 * Skyrim allows elite smiths to forge armor from dragon scales and bones. The modding community has seen fit to add dragonbone weapons as well.
 * Mega Man X Command Mission has Force Metal, used in reploid engineering.

Webcomics

 * The Inexplicable Adventures of Bob has borfomite, a rare substance that becomes an unstoppable weapon when chemically combined with caramel.
 * The Way of the Metagamer has actual unobtainium, which adheres to Minovsky Physics.
 * Though not exactly Applied Phlebotinum (it may yet turn out to be), Roy's sword in The Order of the Stick is enhanced with an alloy of starmetal, which required a sidequest to obtain and quite some time to find a smith to forge it.
 * The time machine in Times Like This is driven by the fictional element Sesquicentium (atomic number 150), a metal that has a tendency to time-warp by itself.

Web Original

 * Whateley Universe has plenty of Unobtainium. They've stolen adamantium from the Marvel Universe, and they've included some of the mystical variants, including orichalcium and mithril. Oddly enough, at the Super Hero School Whateley Academy, mithril no longer counts as true Unobtainium, because there's a side character (Silver, a girl from India) who sweats mithril. The school has had to set up a mithril brokerage.
 * A beautiful example is the wonderflonium of Dr. Horrible's Sing-Along Blog, so salient it's essentially a lampshade.
 * The League of Intergalactic Cosmic Champions had Plotonium as a generic whatever-the-plot-required supermetal. Also a building block of the universe that allowed people to have superpowers was Nevesytrof (much more stable then the Sub-Reality or Super-Reality of other universes.)
 * Protectors of the Plot Continuum has Generic Surface. A material created when locations and surfaces in fanfics are given little or no description, the Flowers have used it to build PPC Headquarters due to its durability, structural integrity, and the fact that there is a readily available supply to make such a huge building out of.
 * Not a metal, but falling under this heading, is Bleeprin and its derivatives. Bleeprin is a mixture of bleach and aspirin, advertised as 'brain bleach', which erases the memory of a bad fanfic and then the headache it gave the agents. Derivatives include Bleepka (Bleeprin and synthetic vodka, a very popular derivative, often used for making cocktails), Bleepolate (Bleeprin and chocolate), and Bleepsinthe (Bleeprin and synthetic absinthe). Bleeprin's only real downside is that it explodes when mixed with real alcohol, hence the use of synthesised substitutes.
 * The SCP Foundation has SCP-148, also known as Telekill. This stuff is incredibly useful, but the Foundation hasn't been able to fully analyse it, let alone make more of the stuff.
 * The inventions of The Spoony Experiment's Doctor Insano are powered by Raritanium.
 * Super Stories has Electronium, resistant to all known methods of scanning (including superpowered ones). Apart from one villain's secret lair being made out of the stuff, no known piece is larger than a pebble.
 * Allen Fesler writes stories set in the Chakona Space 'Verse. One of his inventions is boronike, which is extremely valuable and very useful to engineering types. It is commonly used in teleporter tech because of its inability to be teleported.

Western Animation

 * The Powerpuff Girls employs this in the making of the show's namesake heroes. The Unobtainium here is the mysterious Chemical X (a fancy name for the contents of a Can Of Whoop Ass). It also produced the show's biggest recurring villain, and drove several single-episode plots. Demashita Power Puff Girls Z upgrades it to Chemical Z. One episode shows that you can also get the same results from a prison toilet since that's what Mojo Jojo used to make the Rowdyruff Boys.
 * One arc on Rocky and Bullwinkle involved a search for a mountain full of "Upsidaisium", an anti-gravity metal.
 * The Flintstones had an episode featuring Urgonium - a mineral that exploded on solid impact.
 * Justice League
 * Nth Metal, can, among other abilities, generate electrical currents and disrupting magic.
 * The meson-graviton inversion.
 * The first 2009 episode of The Colbert Report's Show Within a Show Tek Jansen has the Big Bad enslaving some tiny doughboy aliens to mine Scarcerarium.
 * Duck Dodgers went to Planet X to find Aludium Phozdex, the Shaving Cream Atom, in his classic 50s adventure.
 * Spiral Zone has Neutron-90, the rare material that the Zone Riders' uniforms are made from; it protects the soldiers from the Spiral Zone's Mind Control effect. At the beginning of the series, there's only enough of it to make five suits. Later, enough Neutron-90 is discovered to make two additional uniforms, and so Sixth Rangers Ned Tucker and Ben Davis are able to join the team.
 * In ThunderCats and ThunderCats (2011) machines are powered by Thundrilium.
 * In "Phineas and Ferb's Quantum Boogaloo", Phineas and Ferb need a wood and steel fusing tool, which apparently won't be invented for 20 years.
 * In "Vanessassary Roughness," the element "Pizzazium Infinionite" is described as (maybe) having wondrous properties that could be used in the future to power generically-futuristic technology.
 * In Teen Titans the thief Red X used a suit that was powered by Xenothium, which was only described as being unstable and crazy dangerous, but was capable of insane things, such as creating explosive projectiles, shields, metallic bands and all kinds of crazy shizz.
 * Though the Xenothium itself didn't do all that- it just powered the devices that did.
 * Professor Farnsworth once had the crew deliver a single atom of Jumbonium - a tennisball sized "single atom" that doesn't seem to do anything beyond adorn a tiara.
 * If nothing else, it's valued for its rarity; that single atom is worth more than $50,000.
 * When Kowalski of The Penguins of Madagascar builds a time machine, he needs five grams of "Macguffium 239" to power it.
 * The 1987 Teenage Mutant Ninja Turtles use this trope such as the episode, "The Big Zipp Attack", when Shredder needed to obtain an extremely rare and hard metal "rigidium" for the Technodrome.
 * In an episode of the children's show Word Girl, Chuck the Evil Sandwich Making Guy had built a giant sandwich press designed to crush City Hall. He claims it's made out of "super strong steel", and Word Girl is unable to damage it. Considering bending steel beams is usually like snapping a twig for her, it's somewhat ambiguous exactly what metal composition the press was constructed with.

Real Life

 * This is the notional material used in the manufacture of that very important tool or part which you can't seem to find anywhere. For example, at this time, 16 bit PCMCIA cards are one of many peripherals that can be said to be made of Unobtainium.
 * There are many real world examples of unobtainium, perhaps making this one Truth in Television. While the ideas of Mithril and Vibranium actually existing on our earth may be laughable, the idea of a mineral/resource that is near impossible to obtain is almost a historical trope.
 * When Aluminium was first discovered, it was considered unobtainium, because of the great difficulty in making it. Hence, The Washington Monument was capped with a pyramidal ingot of pure aluminum, Napoleon III's sets of dinnerware made from aluminum, and the statue of Anteros in London. Then people discovered an easy way to make aluminium, and it stopped being unobtainium.
 * Astatine: it was estimated that the amount of astatine in the planet barely can be gathered in a spoon, with around 30 grams existing on the entire Earth at any one time. This is because it is a product of radioactive decay, but is radioactive itself, with a half-life of 8.3 hours before decaying to lead.
 * During the Cold War, most of the significant titanium mines were either in the Soviet Union or elsewhere in the Eastern Bloc. As a result, Western aircraft designers often half-jokingly referred to the stuff as "unobtainium." Eventually, new mines were discovered in Australia, South Africa, Canada, and Norway--all safely outside Soviet influence--and titanium stopped being unobtainium for the West. U.S. aircraft designers during this period are the Trope Namer.
 * Also during the Cold War, the US Air Force had a strong desire to develop antimatter bombs, perhaps feeling that hydrogen bombs just weren't apocalyptic enough. Fortunately, there is no known natural source of antimatter and no practical way to make it that can produce the macroscopic quantities of the stuff needed for bombs, and no practical way to contain the stuff safely enough for long enough to make such a weapon useful - critically, a nuclear bomb will not explode unless you want it to, while an antimatter bomb will always try to explode whether you want it to or not.
 * And yet again during the Cold War, a mythic substance known as "red mercury" was used for disinformation purposes by the Soviet Union. This substance was supposedly a high-temperature superconductor, a key ingredient in nuclear weapons, a ballotechnic and a component of certain types of stealth paint. It was apparently successfully used in a number of sting operations, since any organisation or rogue government seeking "red mercury" was clearly up to no good.
 * Wootz steel is a very specific historic case of this. It's made out of crucible-fired sand consisting of iron and tungsten carbide, which only naturally occurs in a very few places, almost all of them in central Asia. The process for making it was lost for centuries after the ore ran out, and was only rediscovered very recently through chemical analysis (the ore contained trace amounts of vanadium that created an unusual spiky crystal structure in the solidifying ingots). By all accounts, wootz steel is both stronger and more flexible than ordinary steel; back when swords were still used as weapons, Indo-Persian swords were highly valued throughout India and the Middle East because of this.
 * Pandemonium Chloride is the evil, HAZMAT twin of unobtainium, a material of unspecified composition that greatly endangers human life with the smallest spills or leaks.
 * Chlorine trifluoride is the real-world stuff. Derek Lowe has a nightmarish description at Sand wont save you this time. From that article: "It is, of course, extremely toxic, but that's the least of the problem. It is hypergolic (combusts spontaneously) with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, and asbestos, sand, and water-with which it reacts explosively."
 * Incidentally, the classical bucket of sand will not save you from it either: it'll just burn through the sand.
 * Greek fire. Accounts say it was a combination of volatile chemicals in liquid form that, when launched, would burn on and be ignited by water. The original formula has been lost, and speculation as to its contents continue today.
 * Judging from its description, it probably had a lot in common with napalm.
 * Not really. Napalm isn't really liquid (it's more sticky, like slime) nor is it ignited by contact with water. Water can put out napalm, as can covering the area of fire with a blanket, neither of which was supposedly possible with Greek fire.
 * Carbon nanotubes have immensely useful electronic, optical, and mechanical properties, including a strength-to-weight ratio vastly superior to any building material currently in use. Sadly, as of 2010, even poor grade nanotubes go for about $100/gram. Guess that space elevator will have to wait a few more years.
 * The biggest problem with them at the moment is to avoid cumulative weakening, as at the moment the more nanotubes you stock together, the more the nanoscopic faults accumulate, until their strength is all but gone. Still, many scientists are confident that they'll have long and durable nanotube strings in a couple of years.
 * Mountain biker slang for a bike made of a rare or expensive material is also 'unobtainium'.
 * In the late 70's Silicon Valley, there were two popular materials for solving otherwise intractable engineering problems, very specifically: Unobtainium-12 and Expensium-6. Neither was in the Grainger's or Thomas catalog.
 * Rare-earth elements are used in most modern electronics, and aren't really rare, but they are hard to find in an economically-usable state. And, in addition, 97% of rare-earth mining is done in China. Because of their usefulness, worries that the Chinese could cut off or severely reduce exports of it is enough that now others countries are looking into reopening mines almost solely so that the Chinese cannot make unobtainium of them.
 * NASCAR racer Junior Johnson had a friend in the aerospace industry who wanted him to try out a brand new material they'd cooked up: carbon fiber. Johnson sent him a pair of control arms to be copied in the material, and was astounded that they weighed less than a single steel arm. Since he was the only person with access to it, there were no rules preventing him from replacing as many parts as he liked with CF. The racing body only took notice of these parts when they were worried that his carbon brakes, visibly glowing from heat, might cause a tire fire.
 * Nuclear physics has created Exotic Matter in exceedingly minute quantities. Synthetic baryons (baryons are particles such as protons and neutrons) contain configurations other than the standard two up/one down, one up/two down, quark arrangements. Theoretically such femtotechnology could lead to a dazzling array of alternate chemistries. Thousands of alternate periodic tables may be possible, maybe more.
 * The synthetic baryons all decay rapidly (the order of 10^-10 sec or shorter halflifes). The chemistry of an atom is determined by the electrons surrounding the nucleus. Atoms with synthetic baryons would be considered different isotopes of the same element.
 * Through Nano-technology it can be possible to manipulate the atomic structure of an element and directly convert it to another. Making acquiring rare minerals and the like a thing of the past, however the technology is not as advanced yet to do so.