tazheranite
A rare zirconium mineral.

teallite
An orthorhombic-dipyramidal mineral containing lead, sulfur, and tin.

tectonite
A tectonically-deformed metamorphic rock

tectonites
plural of tectonite

tedhadleyite
A triclinic-pinacoidal bluish white mineral containing bromine, chlorine, iodine, mercury, and oxygen.

teepleite
A tetragonal-ditetragonal dipyramidal mineral containing boron, chlorine, hydrogen, oxygen, and sodium.

tegengrenite
A trigonal dark red mineral containing antimony, magnesium, manganese, oxygen, silicon, titanium, and zinc.

teineite
An orthorhombic-disphenoidal mineral containing copper, hydrogen, oxygen, and tellurium.

telargpalite
An isometric steel gray mineral containing palladium, silver, and tellurium.

telesia
sapphire (precious stone)

tellurantimony
A trigonal-hexagonal scalenohedral silver white mineral containing antimony and tellurium.

telluret
telluride

tellurets
plural of telluret

telluride
A binary compound of a metal with tellurium; metal salts of tellurane
Any organic compound of general formula R₂Te (R not = H), the tellurium analogues of ethers
Sylvanite, silver gold telluride.

tellurides
plural of telluride

tellurobismuthite
A soft dull grey mineral form of bismuth telluride.

tellurobismuthites
plural of tellurobismuthite

tellurohauchecornite
A tetragonal-ditetragonal dipyramidal bronze mineral containing bismuth, nickel, sulfur, and tellurium.

telluronevskite
A trigonal-hexagonal scalenohedral steel gray mineral containing bismuth, lead, selenium, sulfur, and tellurium.

telluropalladinite
A monoclinic-prismatic silver white mineral containing palladium and tellurium.

telyushenkoite
A trigonal-hexagonal scalenohedral mineral containing aluminum, beryllium, cesium, fluorine, oxygen, potassium, rubidium, silicon, sodium, and zinc.

tengchongite
An orthorhombic-disphenoidal yellow mineral containing calcium, hydrogen, molybdenum, oxygen, and uranium.

tephriphonolite
A mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite.

tephrite
An igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both.

tephrites
plural of tephrite

tephroid
A variety of tephrite.

tephroids
plural of tephroid

tephroite
An orthorhombic-dipyramidal mineral containing manganese, oxygen, and silicon.

tephroites
plural of tephroite

terlinguaite
A monoclinic-prismatic mineral containing chlorine, mercury, and oxygen.

ternesite
An orthorhombic-dipyramidal mineral containing calcium, oxygen, silicon, and sulfur.

ternovite
A monoclinic white mineral containing calcium, hydrogen, magnesium, niobium, and oxygen.

terpitzite
Synonym of geyserite.

terranovaite
An orthorhombic-dipyramidal mineral containing aluminum, calcium, hydrogen, magnesium, oxygen, potassium, silicon, and sodium.

terskite
An orthorhombic-pyramidal mineral containing hydrogen, manganese, oxygen, silicon, sodium, and zirconium.

tertschite
A monoclinic snow white mineral containing boron, calcium, hydrogen, and oxygen.

teruggite
A monoclinic-prismatic colorless mineral containing arsenic, boron, calcium, hydrogen, magnesium, and oxygen.

teschemacherite
An orthorhombic-dipyramidal mineral containing carbon, hydrogen, nitrogen, and oxygen.

testibiopalladite
An isometric-tetartoidal mineral containing antimony, palladium, and tellurium.

tetartoid
A crystal of a certain symmetry class with 12 congruent irregular pentagonal faces.

tetartoids
plural of tetartoid

tetraferriphlogopite
Unusually iron-rich phlogopite.

tetraferriphlogopites
plural of tetraferriphlogopite

tetraferroplatinum
A tetragonal-ditetragonal dipyramidal white mineral containing iron and platinum.

tetrarooseveltite
A tetragonal-dipyramidal mineral containing arsenic, bismuth, and oxygen.

tetrataenite
The tetragonal crystalline form of taenite

tetrataenites
plural of tetrataenite

tetrawickmanite
A tetragonal-dipyramidal mineral containing hydrogen, manganese, oxygen, and tin.

tezontle
A porous, extrusive, igneous, volcanic rock, usually reddish in colour, used extensively in construction in Mexico.

thadeuite
An orthorhombic-disphenoidal yellow orange mineral containing calcium, fluorine, hydrogen, iron, magnesium, manganese, oxygen, and phosphorus.

thalcusite
A tetragonal-ditetragonal dipyramidal mineral containing copper, iron, sulfur, and thallium.

thalfenisite
An isometric-hexoctahedral mineral containing chlorine, copper, iron, nickel, sulfur, and thallium.

thaumasite
A hexagonal-dipyramidal mineral containing calcium, carbon, hydrogen, oxygen, silicon, and sulfur.

theisite
An orthorhombic mineral containing antimony, arsenic, copper, hydrogen, oxygen, and zinc.

thenardite
An orthorhombic-dipyramidal mineral containing oxygen, sodium, and sulfur.

theoparacelsite
An orthorhombic-dipyramidal dark pistachio green mineral containing arsenic, copper, hydrogen, and oxygen.

theophrastite
A trigonal-hexagonal scalenohedral emerald green mineral containing hydrogen, nickel, and oxygen.

thinolite
a pseudomorph of ikaite, found in Quaternary lake basins of Nevada.

thinolites
plural of thinolite

thokcha
A tektite or meteorite containing iron, historically valued for metalworking.
An ancient metal object made from these and serving as an amulet.

tholeiite
An igneous basaltic rock, formed from magma rich in magnesium and iron.

tholeiites
plural of tholeiite

thomasclarkite
A rare earth mineral.

thometzekite
A monoclinic-prismatic mineral containing arsenic, copper, hydrogen, lead, oxygen, and zinc.

thomsenolite
A monoclinic-prismatic mineral containing aluminum, calcium, fluorine, hydrogen, oxygen, and sodium.

thomsonite
Ozarkite, a mineral native to the United States.

thomsonites
plural of thomsonite

thorbastnasite
A hexagonal-ditrigonal dipyramidal brown mineral containing calcium, carbon, cerium, fluorine, hydrogen, oxygen, and thorium.

thoreaulite
A monoclinic-prismatic mineral containing oxygen, tantalum, and tin.

thorikosite
A tetragonal-ditetragonal dipyramidal light yellow mineral containing antimony, arsenic, chlorine, hydrogen, lead, and oxygen.

thornasite
A trigonal-hexagonal scalenohedral mineral containing hydrogen, oxygen, silicon, sodium, and thorium.

thorogummite
A tetragonal-ditetragonal dipyramidal mineral containing hydrogen, oxygen, silicon, and thorium.

thorosteenstrupine
An amorphous mineral containing calcium, fluorine, hydrogen, manganese, oxygen, silicon, and thorium.

thorosteenstrupines
plural of thorosteenstrupine

thorutite
A monoclinic-prismatic mineral containing calcium, hydrogen, oxygen, thorium, titanium, and uranium.

threadgoldite
A monoclinic-prismatic greenish yellow mineral containing aluminum, hydrogen, oxygen, phosphorus, and uranium.

thucholite
A radioactive pyrobitumen mineral.

thucholites
plural of thucholite

thunderegg
A roughly spherical, nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow.

thundereggs
plural of thunderegg

tienshanite
A hexagonal-dipyramidal pistachio green mineral containing barium, boron, manganese, oxygen, silicon, sodium, and titanium.

tiettaite
An orthorhombic mineral containing hydrogen, iron, oxygen, potassium, silicon, sodium, and titanium.

tik
crystal meth or speed.

tikhonenkovite
A monoclinic mineral containing aluminum, fluorine, hydrogen, oxygen, and strontium.

tilasite
A monoclinic-prismatic mineral containing arsenic, calcium, fluorine, magnesium, and oxygen.

tilleyite
A monoclinic-prismatic mineral containing calcium, carbon, oxygen, and silicon.

tinaksite
A triclinic mineral containing calcium, hydrogen, iron, manganese, oxygen, potassium, silicon, sodium, and titanium.

tincalconite
A hydrous sodium borate mineral closely related to borax.

tinkalite
borax

tinsleyite
A monoclinic-prismatic dark red mineral containing aluminum, hydrogen, oxygen, phosphorus, and potassium.

tinstone
The mineral cassiterite.

tinstones
plural of tinstone