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Tetranatrolite: Na2[Al2Si3O10]·2(H2O) Gonnardite: Na2CaAl4Si6O20·7(H2O)
Comments: White, pseudocubic crystals of tetranatrolite (gonnardite) on matrix. Location: Point of Rocks Mesa, Colfax County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Tetrataenite: FeNi
Comments: a) B&W reflected-light image of lightly etched tetraraenite (Tt), cloudy taenite (CT), and kamacite (K) and b) X-polarizer image showing unetched optical anisotropy and irregular crystals in the tetrataenite rim. Location: Estherville mesosiderite meteorite. AmMin v65:624. Scale: Scale Bar 50 µm. © American Mineralogist
Tetrawickmanite: Mn++Sn++++(OH)6
Comments: Tan, pseudoctahedral crystal of tetrawickmanite on matrix. Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Thalenite-(Y): Y3Si3O10(OH)
Comments: Subhedral, brownish thalenite-(Y) crystal embedded in a sucrosic matrix of yttrian fluorite. Location: Hundholmen, Tysfjord, Norway. Scale: 0.5 cm. © Sigurd Stordal / University of Tromsoe
Thalfenisite: Tl6(Fe,Ni,Cu)25S26Cl
Comments: Polished 2mm fragment of thalfenisite in epoxy mount.. Location: Oktyabr'sky mine, Noril'sk, Siberia, Russia. Scale: 1.2cm across. © Tom Loomis / Dakota Matrix
Thaumasite: Ca3Si(CO3)(SO4)(OH)6·12(H2O)
Comments: Transparent crystal of thaumasite. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 1.1 x 0.4 cm. © John Veevaert
Comments: Doubly-terminated Thaumasite. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 1 cm across. © John Veevaert
Theisite: Cu5Zn5[(As+++++,Sb+++++)O4]2(OH)14
Comments: Pale blue pearly theisite scattered on matrix. Location: Grand Junction, Mesa County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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