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Thoreaulite: Sn++Ta2O6
Comments: Yellow thoreaulite grain. Location: Ognevka Ta Deposit, Kalba Range, Shyghys Qazaqstan Oblysy (Vostochno-Kazakhstanskaya [Eastern-Kazakhstan] Oblast'), Kazakhstan. Scale: Grain size 1 mm. © Thomas Witzke / Abraxas-Verlag
Thorikosite: Pb3(Sb+++,As+++)O3(OH)Cl2
Comments: Yellow, prismatic crystals of Thorikosite on matrix. Location: Passa Limani Cove slag locality, Passa Limani area, Lavrion District, Attikí (Attica; Attika) Prefecture, Greece. Scale: Picture size 1.6 mm. © Thomas Witzke / Abraxas-Verlag
Thortveitite: (Sc,Y)2Si2O7
Comments: Small white prismatic crystals of thortveitite on matrix. Location: A4 highway tunnel, Thiemendorf, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 1.7 mm. © Thomas Witzke / Abraxas-Verlag
Tikhonenkovite: SrAl(OH)F4·(H2O)
Comments: Colorless tikhonenkovite grain. Location: Karasug Fe-REE-barite-fluorite Deposit, Tannu-Ola Range, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Grain length 1.8 mm. © Thomas Witzke / Abraxas-Verlag
Tiragalloite: Mn++4As+++++Si3O12(OH)
Comments: Orange crystals of tiragalloite in matrix. Location: Molinello Mine, Val Graveglia, Liguria, Italy. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
Titanowodginite: (Mn++,Fe++)(Ti,Sn)(Ta,Nb)2O8
Comments: Black crystals of titanowodginite in matrix. Location: Tanco Mine (Bernic Lake Mine), Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Tlalocite: Cu10Zn6(Te++++O3)(Te++++++O4)2Cl(OH)25·27(H2O)
Comments: Green, spherulitic aggregates of Tlalocite on matrix. Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Tlapallite: H6(Ca,Pb)2Cu3(SO4)(Te++++O3)4(Te++++++O6)
Comments: Green, microcrystalline druse of tlapallite grains. Location: Bambollita Mine (Oriental Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tochilinite: 6Fe0.9S·5(Mg,Fe++)(OH)2
Comments: Grayish-black, metallic wires of tochilinite on matrix. Location: Brosso Mine, Ivrea, Piedmont, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tolbachite: CuCl2
Comments: Small orange-brownish crystals of tolbachite. Location: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 2.5 mm. © Thomas Witzke / Abraxas-Verlag