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Thorogummite: Th(SiO4)1-x(OH)4x
Comments: Yellow-tan resinous thorogummite with calcite. Location: Fort Dauphin, Toliara, Madagascar. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Pale tan to yellowish thorogummite pseudomorphous after thorite in matrix. Location: Fort Dauphin (Tôlanaro) area, Toliara (Tuléar) Province, Madagascar. Scale: Picture size 5 mm. © Paul M. Schumacher
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
Thorutite: (Th,U,Ca)Ti2(O,OH)6
Comments: Spherical aggregate of black thorutite. Location: Brumado, Brazil. Scale: Sphere Diameter 0.25 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Threadgoldite: Al(UO2)2(PO4)2(OH)·8(H2O)
Comments: Beige threadgoldite filling cracks in, and coating, black uraninite. Schumacher Collection. Location: Kobokobo Pegmatite, Lusungu River District, Kivu, Congo (Zaïre). Scale: Picture size 5 mm. © Paul M. Schumacher
Tiemannite: HgSe
Comments: Dull black tiemannite masses on limestone. Location: Marysvale, Piute County, Utah. USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Dull steel-gray, tetragonal crystals of tiemannite to 0.5mm with modifications and striations, slight purple tinge. Location: Rio Blanco, Pinal De Arvole, Atriagu, Queretare, Mexico. Scale: Picture size 2 mm. © Tom Loomis / Dakota Matrix
Tiemannite: HgSe Tischendorfite: Pd8Hg3Se9 Chrisstanleyite: Ag2Pd3Se4
Comments: Polished section (PPL) showing tischendorfite (T, cream), clausthalite (Cl, off-white), tiemannite (Tie, gray), ankerite (black) and chrisstanleyite (C, greenish buff to pale brown). Location: Eskaborner Stollen (Eskeborn Adit) at Tilkerode, Harz, Mountains, Germany. (CanMin v40:739). Scale: Picture Size 275 µm. © Canadian Mineralogist
Tienshanite: BaNa2MnTiB2Si6O20 Kupletskite-(Cs): (Cs,K)2Na(Mn,Fe++,Li)7(Ti,Nb)2Si8O26(OH)4F
Comments: Dark olive-green colored crystalline tienshanite with cesium-kupletskite in microcline. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Tilasite: CaMg(AsO4)F
Comments: Brownish, prismatic crystals of tilasite. Location: Cervandone, Val d'Ossola Lombardy, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Tilleyite: Ca5Si2O7(CO3)2
Comments: Opaque white fibrous tilleyite with blue calcite. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tin: Sn
Comments: Stream rounded silvery metallic tin grains. Location: Near Oban, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tin: Sn Sorosite: Cu(Sn,Sb) Stistaite: SnSb
Comments: Back-scattered electron image of large sorosite crystal (So=partly skeletal) adjacent to stistaite (St). Tn=native tin. Note abundant microcrystals of sorosite isolated within native tin. (AmMin 83:903). Location: Baimka gold-platinum group mineral placer deposit, Chukotka, Russian Far East. Scale: Image Size 1.5 cm. © American Mineralogist
Tinaksite: K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)] Charoite: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O)
Comments: Yellow-brown prismatic tinaksite crystals in purple charoite with black aegirine. Location: Murun, Aldan Uplift, Chara and Olekma Rivers, near Olekminsk, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Polished slab of deep purple chariote with inclusions of black augite, white feldspar and orange tinaksite. Location: Murun, Siberia, Russia. Scale: Picture size 10 cm. © Kevin Ward
Tincalconite: Na6[B4O5(OH)4]3·8(H2O)
Comments: Pristine white tincalconite pseudomorph after a single borax crystal. Location: Boron, Kramer District, Kern Co., California, USA. Scale: 30x14x5 mm. © John Betts - Fine Minerals
Tinsleyite: KAl2(PO4)2(OH)·2(H2O) Phosphosiderite: Fe+++PO4·2(H2O) Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite. Location: Bendada, Guarda, Portugal. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tinticite: Fe+++5(PO4,VO4)4·7(H2O)
Comments: Porcelaneous tinticite chip. Location: Near Tintic Standard Mine, Tintic District, Juab County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tintinaite: Pb22Cu+4(Sb,Bi)30S69
Comments: Massive silvery metallic tintinaite in matrix. Location: Roznava, Slovak Republic. Scale: Specimen Size 2 x 4 cm. © Diederik Visser