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Synchysite-(Y): CaY(CO3)2F
Comments: Small thin tabular crystals of synchysite-(Y) in a vug. Location: Cuasso da Monte, Varese province, Lombardy, Italy. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Tamarugite: NaAl(SO4)2·6(H2O)
Comments: Small white flakes of Tamarugite. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tausonite: SrTiO3
Comments: Brown crystal of tausonite in matrix. Location: Murun massif, Chara River, Davan, Torgo River Basin, Aldan Shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Tazheranite: CaTiZr2O8
Comments: Brown grain of tazheranite in matrix. Location: Tazheran Massif, Lake Baikal area, Irkutskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Tegengrenite: (Mg,Mn++)2Sb+++++0.5(Mn+++,Si,Ti)0.5O4
Comments: Red, pseudo-octahedral crystal of tegengrenite in quartz. Location: Jakobsberg, Nordmark, Filipstad, Värmland, Sweden. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
Teineite: CuTeO3·2(H2O)
Comments: Green teineite on matrix. Location: Salm Chateau, Vielsalm, Belgium. Scale: Picture Size 4mm. © Thomas Witzke
Terlinguaite: Hg+Hg++ClO
Comments: Beige, massive granular crystals of terlinguaite on pink calcite. Location: Mariposa mine, Terlingua, Terlingua district, Brewster Co., Texas, USA. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tetra-auricupride: AuCu
Comments: Golden brown crystals of tetra-auricupride on matrix. Location: Karabash (Karabasch), Chelyabinsk Oblast', Urals Region, Russia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Tetrarooseveltite: BiAsO4
Comments: Light-yellow, earthy tetrarooseveltite. Location: Moldava, Teplice (Teplitz), Krusné Hory (Erzgebirge), Severoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Thenardite: Na2SO4
Comments: White thenardite on augite-nephelinite rock. Location: Bärenstein Quarry, Niederschlag, Oberwiesenthal, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag