F:

NAME	ORIGIN	REFERENCE	PROPERTIES
Feldomite	Naturally occurring.	DS9: Business As Usual	A valuable substance recently and unexpectedly found on Parsion III.
Felicium	Naturally occurring.	TNG: Symbiosis	A substance produced from plants by the people of Brekka. It was once used to cure a deadly plague. It also has addictive properties.
Ferric oxide	Naturally occurring.	VOY: The 37'S	Ferric oxide corrodes iron particles into rust.
Fistrium	Naturally occurring.	TNG: Silicon Avatar	Refractory metal found in caves of Melona IV. Theorized that the prescence of fistrium and kelbonite prevented the Crystalline Entity from scanning the caves.
Fortanium	Naturally occurring.	TNG: Masks	Used in the composition of the informational archive at the comet's core.

G:

NAME	ORIGIN	REFERENCE	PROPERTIES
Gallicite	Naturally occurring.	VOY: Blood Fever	Gallicite is a rare substance which can be used to refit warp coils.
Gallium arsenide	Origin unknown.	TNG: Home Soil	Gallium arsenide was one of the impurities found on Velara III.
Garnesite	Naturally occurring.	VOY: Parturition	Paris and Neelix fire their phasers at these rocks in order to get a little heat and light in the cave.
Gold-pressed Latinum	Origin unknown.	DS9: all	A non-replicatable material, typically pressed into bars, like gold and used as a form of currency.
Golside ore	Origin unknown.	DS9: The Maquis, Part I	An ore which Dukat claimed the Bok'Nor had just delivered 14 metric tons of to the Regulon system before stopping at DS9.

H:

NAME	ORIGIN	REFERENCE	PROPERTIES
Hydrazine	Artifically generated by crew.	VOY: The Coda	There was a hydrazine gas leak in the shuttle after it is struck by lightning; they evacuate the shuttle after the hydrazine levels reach 112 parts per million.
Hydrocortilene	Artificially generated by crew.	VOY: The Swarm	The Doctor tells Kes to prepare a hypospray with 3% hydrocortilene to treat Torres's headache.
Hyronalin	Artificially generated by crew.	VOY: Real Life	The Doctor gives Paris a combination of hyronalin and lectrazine to give him temporary protection from radiation poisoning.
Hyttrium	Naturally occurring.	TNG: The Most Toys	Only known cure for tricyanate contamination of water supplies. Highly volatile.Used to explode a shuttlecraft so that Kivas Fajo could kidnap Data without suspicion.

I:

NAME	ORIGIN	REFERENCE	PROPERTIES
Ilium 629	Naturally occurring.	TNG: Pen Pals	A by-product of the geological decay of dilithium. Traces of ilium 629 were found on the planet Drema IV, leading to the discovery of unusual dilithium deposits in the planet's mantle. The dilithium transformed the planet's geological heat into mechanical stress, resulting in significant tectonic instabilities that nearly destroyed the planet. The geological instabilities were neutralized by the use of resonator probes launched from orbit.
Impedrezene	Artificially generated by crew.	VOY: Alliances	The Doctor gives Bendera 75 cc's of this drug to try to stimulate his cardiac functions.
Improvoline	Artificially generated by crew.	VOY: Basics, Part 2	The Doctor wants to give Suder 5 cc's of improvoline to calm him down after he has had to kill a Kazon.
Inapprovaline	Artificially generated by crew.	VOY: Lifesigns	Kes suggests that they stimulate cell regeneration by giving Denara Pel a high dosage of inapprovaline; the Doctor says it is too late for that.
Infernite	Origin unknown.	DS9: In the Hands of the Prophets	When mixed with carbrodine, becomes explosive.
Invidium	Origin unknown.	TNG: Hollow Pursuits	Used in medical containment fields the previous century. No longer used. Causes adverse reactions with equipment. It affected the magnetic capacitors on the antimatter injector and an un-named component in the transporter.
Iridium	Naturally occurring.	TOS: Requiem for Methesulah	A heavy element of the platinum group. The iridium rendered the Ritalin inert and therefore unusable in combating an epidemic that the crew was trying to prevent on another planet.
Isoboromine	Naturally occurring.	DS9: Equilibrium	A neurotransmitter in Trills which maintains the link between symbiont and host. If its level gets too low, the symbiont must be removed or it will die. Dax had a low isoboromine count from the hallucinations of Joran Dax.

J:

NAME	ORIGIN	REFERENCE	PROPERTIES
Jakmanite	Naturally occurring.	TNG: Hollow Pursuits	Like invidium, jakmanite cannot be detected by internal sensors. Exists in oxygen environment, and like invidium, can alter advanced structures like glass. Duffy ruled jakmanite out as a possible cause of the problems experienced by the Enterprise crew.
Jevonite	Naturally occurring.	TNG: Chain of Command Part II	Valuable gemstone found on Cardassia. Ancient jevonite artifacts found on Cardassia were sold or stolen by the army to finance the war effort.

K:

NAME	ORIGIN	REFERENCE	PROPERTIES
Kayolane	Artificially generated by aliens.	TNG: Identity Crisis	A sedative. Beverly inoculates Leijten with kayolane after the latter's blood chemistry changes and after she exhibits strange behavior.
Kelbonite	Naturally occurring.	TNG: Silicon Avatar	Refractory metal found in caves of Melona IV. Data thought the prescence of kelbonite and fistrium prevented the Crystilline Entity from scanning caves.
Kelotane	Artificially generated by crew.	VOY: State of Flux	The Doctor tells Kes to prepare 3 cc's of kelotane when Seska is beamed back to Voyager after she is injured on the Kazon ship.
Kemacite	Origin unknown.	DS9: Little Green Men	An illegal substance which Quark was going to smuggle to Orion on the way back from Earth. Its reaction to vented plasma from the warp core triggered a time warp.
Ketracel White	Artificially generated by aliens.	DS9: many	A vital, isogenic enzyme needed for the survival of the Jem'Hadar. The enzyme can only be provided by the Founders, and currently cannot be reproduced by the Federation. The Founders engineered the Jem'Hadar's addiction to this enzyme to ensure their loyalty to the Dominion.
Kironide	Artificially generated by aliens.	TOS: Plato's Stepchildren	Induces telekinetic powers. Platonians used it to hold Enterprise crew captive and force them to perform for their amusement. McCoy synthesized the chemical so crew could escape.
Koranium	Origin unknown.	DS9: Blood Oath	Subspace element used in Klingon warp drives. Mentioned briefly as being a part of warp drive in the injectors.

L:

NAME	ORIGIN	REFERENCE	PROPERTIES
Lactic acid	Naturally occurring.	VOY: Sacred Ground	The Doctor detects a gradual buildup of lactic acid in Janeway's extensor muscles over the last few hours which indicates that she is experiencing a light strain.
Ladarium	Artificially generated by aliens.	DS9: Tribunal	A substance used in Cardassian warp engines. Boone told O'Brien that he was now running a ladarium mining sluice on Volan III.
Lectrazine	Artificially generated by crew.	VOY: Lifesigns	The Doctor orders 20 milligrams of this after the Vidiian is transported to sick bay. Lectrazine is used to try to counteract the disruptions in her cardiac functions.
Lexorin	Artificially generated by crew.	ST: TSFS	A seditive. When Kirk visits McCoy in the brig he brings lexorin to help make the ride easier.
Lucrovexitrin	Origin unknown.	TNG: Hollow Pursuits	Highly toxic; alters molecular structure when it comes in contact with glass. Exists in a Nitrogen-Oxygen atmosphere.
Lydroxide corrosive	Artificially generated by the crew.	VOY: Rise	This is a coolant used in the tether couplings; Vatm was poisoned when someone put this in the water supply.

M:

NAME	ORIGIN	REFERENCE	PROPERTIES
Magnasite	Naturally occuring.	DS9: Nor the Battle to the Strong	Prevents Federation transporters to beam through it.
Meranium	Artificially generated by aliens.	TNG: The Vengeance Factor	A metal alloy. Its melting point is 2014 degrees Fahrenheit. The away team fired their phasers into the meranium alloy, causing a smoke screen.
Mercassium	Artificially generated by crew.	DS9: The Maquis, Part I	A synthetic composite used by the Federation in the construction of shield generators. Traces of it were found in the debris of the destroyed Bok'Nor.
Merculite	Artificially generated by aliens.	TNG: Suddenly Human	An explosive material used in out-of-date rockets which are no match for Federation weaponry.
Minzinite	Origin unknown.	DS9: Statistical Probabilities	Several deposists were found on Holna IV.