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T:

NAME ORIGIN REFERENCE PROPERTIES
TalgoniteArtificially generated by aliens.TNG: The Inner LightA ceramic substance. Used in the construction of the Kataan probe.
TekasiteOrigin unknown.DS9: By Inferno's LightA bomb containing trilithium, tekasite and protomatter, intended to be used by the Bashir Changeling to destroy the Bajoran sun.
TelleriumOrigin unknown.VOY: ResistanceCrystal used to stabilise the harmonic reactions inside the dilithium chamber of Voyager's matter / antimatter power reactor.
TerminiumOrigin unknown.ST: TSFSA metal alloy. Used in casing of photon torpedoes.
TerrionArtificially generated by aliens.TNG: TapestryA compressed terrion beam "mortally" wounded Picard at the beginning of the episode.
TetralubisolOrigin unknown.TOS: The Concience of the KingHighly volatile lubricant used on starships. Lenore Karidian attempted to kill Kevin Riley by poisoning his milk with tetralubisol.
ThaliumNaturally occurring.TNG: Who Watches the WatchersThalium compound is found in rocks. It interferes with Federation sensors.
ThalmeriteNaturally occurring.VOY: Ex Post FactoJaneway warns the Numiri that the shuttlecraft they have boarded is loaded with 40 tons of thalmerite explosives and that Janeway will detonate it in 30 seconds unless the Numiri release the shuttle.
ThoriumNaturally occurring.VOY: Day Of HonorRahmin says that the Caatati need thorium isotopes and that without them their systems can't function.
TitaniumNaturally occurring.ST:FC Naturally ocurring element, present in limited quantities on Earth. Used in alloys to strengthen metal and in the construction of the "Blackbird" spyplane.
ToraniumNaturally occuring.DS9: The ForsakenAn extremely strong metal used in Cardassian bulkheads.
TriadiumArtificially generated by aliens.VOY: RiseA mineralogical scan of the asteroid fragment reveals that the fragment is composed of tryoxene, olivine, and triadium; triadium is an alloy. The source of the triadium is an control node for a guidance system in the asteroid.
TrianiumArtificially generated by aliens.VOY: The '37sUsed in fusion-based power sources. Kim and Chakotay located the alien stasis chamber by tracking down trianium readings.
TriceronOrigin unknown.TNG: ReunionAn explosive compound. Used in the bomb that exploded during the Sonchi ceremony.
TricobaltOrigin unknown.TOS: A Taste of ArmageddonPresumably something to do with three cobalt atoms. While the Enterprise was in orbit it was classified destroyed by a tricobalt satellite explosion in the war which is carried on by computers between Eminiar 7 and Vendecar.
TricyanateNaturally occurring.TNG: The Most ToysA toxic, inorganic substance which forms pink crystals. They are difficult and expensive to synthesize. Decontamination of tricyanate in a water supply requires the highly volatile hytritium.
TridiumNaturally occuring.DS9: Q-LessA radioactive isotope used to locate graviton fields.
TrilithiumArtificially generated by aliens.TNG: Starship MineAn advanced form of dilithium. Used to collapse a star by dampening the energies in its core.
Trillium 323Naturally occurring.TNG: The PriceA mineral substance. Used as a bargaining tool in the Chrysalian bid for the Bazaran Wormhole.
TrimagnesiteNaturally occurring.TOS: Operation - Annihilate!A substance that reacts with trevium to produce non-visible, ultra violet radiation. Satellites containing trimagnesite and tritium were placed in orbit over the planet Deneva to destroy creatures that had taken over the bodies of the inhabitants.
Trinitrogen chlorideArtificially generated by aliens.DS9: Things PastA cleaning solution which Timor, Jillur and Ishan used while working for Quark which was later used in a plasma grenade during an assassination attempt on Gul Dukat.
TriptinOrigin unknown.DS9: In the CardsA statue sold at an auction to Quark was made partially of this.
TritaniumOrigin unknown.TOS: ObsessionExtremely hard substance used in construction of starship hulls. 21.4 times as hard as diamond.
TritiumNaturally occurring.TOS: Operation - Annihilate!A radioactive isotope of hydrogen with atoms of three times the mass of ordinary light hydrogen atoms. Causes gravimetric disturbances.
TryoxeneNaturally occurring.VOY: RiseA mineralogical scan of the asteroid fragment reveals that the fragment is composed of tryoxene, olivine, and triadium.
TryptamineNaturally occurring.TNG: All Good ThingsBiological result of exposure to a temporal disturbance - indicated by elevated levels in the brain. Used by Dr. Crusher to determine whether Picard had actually been leaving the Enterprise as he claimed.


U:

NAME ORIGIN REFERENCE PROPERTIES
UltritiumOrigin unknown.TNG: ManhuntChemical explosive almost undetectable by transporter scanners. Used by the Antidean delegates in an attempted assassination of everyone at the Pacifica Conference of 2365.
UridiumNaturally occuring.DS9: Civil DefenseAn ore that used to be processed on DS9. Very unstable, but needs a strong electrical charge to detonate it when in raw form. Sisko, O'Brien, and Jake used it to blow open a panel.
Uridium bycantizineArtificially generated by aliens.DS9: Statistical ProbabilitiesOne of the active ingredients in Ketracel-white. It can be made by breaking down trinucleic fungus.


V:

NAME ORIGIN REFERENCE PROPERTIES
VenderiteNaturally occurring.TNG: RascalsAn extremely valuable element or mineral to the Ferengi. Rogue Ferengi capture a science team and the USS Enterprise crew to use them as slave laborers to mine for venderite.
Verterium cortenideNaturally occurring.VOY: InvestigationsA composite material composed of polysilicate verterium and monocrystal cortenum. Voyager needs this material to rebuild the warp coils.
VeridiumArtificially generated by crew.ST:TUCCan be detected at great distances, except through a magnetic shield.
Victurium AlloyArtificially generated by crew.TNG: Hero WorshipA very dense metal alloy. Large amounts of it blocked the transporter.
ViteriumArtificially generated by aliens.DS9: ValiantA very strong, resilient alloy which becomes unstable when exposed to delta radiation. The antimatter storage system of the Dominion battleship encountered by the Valiant had support braces made of viterium.
VoriliumNaturally occurring.VOY: DarklingOne of the asteroids in the system is rich in vorilium.


W:

NAME ORIGIN REFERENCE PROPERTIES


X:

NAME ORIGIN REFERENCE PROPERTIES


Y:

NAME ORIGIN REFERENCE PROPERTIES
Yominium SulfideOrigin unknown.ST:TVHSpock recalls the chemical formula for yominium sulfide [K4Ym3(SO73Es2)] during a memory test during his re-education of Vulcan. The formula is inconsistent with that of a sulfide.


Z:

NAME ORIGIN REFERENCE PROPERTIES
ZeniteNaturally occurring.TOS: Cloud MindersZenite in its naturally found state causes temporary mental impairment when its dust is breathed. Such an effect had profound social implications in separating the Troglite miners from the Stratus city dwellers, an issue which the crew of the Enterprise had to deal with.