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Tungstite: WO3·(H2O)
Comments: Yellow tungstite. Location: San Antonio de Calacalani mine, Cercado, Oruro, Bolivia. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tungusite: [Ca14(OH)8](Si8020)(Si8020)2[Fe++9(OH)14]
Comments: Green to white platy tungusite rosettes. Location: Nizhnyaya Tunguska River, near Tura, Evenkia, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tunisite: NaCa2Al4(CO3)4(OH)8Cl
Comments: Transparent pearly platy tunisite microcrystal. Location: Condorcet, Drome, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tuperssuatsiaite: Na(Fe+++,Mn)3[Si8O20](OH)2·n(H2O) Aluminoferrotschermakite: [ ]Ca2(Fe2+)3Al2(Si6Al2)O22(OH)2
Comments: Golden acicular tuperssuatsiaite crystal spray with clear apophyllite and dark green aluminoferrotschermigite. Location: Aris Quarry, Khomas, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tuperssuatsiaite: Na(Fe+++,Mn)3[Si8O20](OH)2·n(H2O)
Comments: Rich, brown tufts up to 0,4 cm of acicular tuperssuatsiaite crystals on a phonolite matrix. Location: Aris Phonolite, Namibia. Scale: Picture size 4 cm. © Sandro Maggia/Minernet.it
Comments: Two mm golden acicular sprays of tuperssuatsiaite on matrix. Location: Aris Quarry, Windhoek, Namibia. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Turanite: Cu5(VO4)2(OH)4
Comments: The holotype specimen of botryodal, olive green turanite (#3578) in a cavite in white barite from the collection of the Fersman Mineralogical Museum (Moscow, Russia). (CanMin, v 42, p732). Location: Tyuya-Muyun Ra-U deposit, the Alai Ridge foothills, Osh district, Kyrgyzstan. Scale: Specimen size 4.5 x 7.5 cm. © N.A. Pekova
Comments: SEM image of turanite crystals (a) parallel intergrown crystals. Location: Tyuya-Muyun Ra-U deposit, the Alai Ridge foothills, Osh district, Kyrgyzstan. Scale: See ImaGE. © Canadian Mineralogist
Turkestanite: Th(Ca,Na)2(K1-x,[ ]x)Si8O20·n(H2O)
Comments: Green, blocky, prismatic crystal of turkestanite in matrix. Location: Dara-i-Pioz Glacier, Alayskiy (Alai) Range, Tien Shan Mts, Districts of the Republican Subordination, Tajikistan. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Turneaureite: Ca5[(As,P)O4]3Cl Donpeacorite: (Mn,Mg)MgSi2O6 Parvowinchite: Na(NaMn++)(Mg4Fe+++)Si8O22(OH)2
Comments: Colorless, transparent turneaureite masses with light brown tirodite (parvowinchite) and darker brown donpeacorite. Location: 2500' level of the mine, ZCA Mine No. 4 (St Joe Mine; ZCA No. 4 mine), Balmat, Balmat-Edwards Zinc District, St Lawrence Co., New York, USA. Scale: Picture Size 0.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Turquoise: CuAl6(PO4)4(OH)8·4(H2O)
Comments: Blue, triclinic crystals (rare) of turquoise on matrix. Location: Lynch Station, Campbell County, Virginia, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Turtmannite: (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20+x
Comments: Orange-brownish grains of turtmannite in matrix. Location: Pipji Glacier, Turtmanntal (Turtmann Valley), Wallis (Valais), Switzerland. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Tuscanite: K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)·(H2O) Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Comments: Translucent tuscanite microcrystal in in vug in low-Fe augite (var. fassaite). Location: Pitigliano Quarry, Grosseto, Tuscany, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tuzlaite: NaCaB508(0H)2·3(H2O)
Comments: Prismatic colorless crystals of tuzlaite. Location: Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Tychite: Na6Mg2(CO3)4(SO4)
Comments: Nearly transparent tychite crystal. Location: Searles Lake, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tyretskite: Ca2B5O9(OH)·(H2O)
Comments: Gray granular tyretskite coating. Location: Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tyrolite: CaCu5(AsO4)2(CO3)(OH)4·6(H2O)
Comments: Blue, crystalline aggregates of tyrolite on matrix. Location: Lake Serene mine, Index, Snohomish County, Washington, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Blue-green flattened, felted, platy crystals of tyrolite to 3mm on matrix. Location: Centennial Eureka mine, Juab Co., Utah, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Tyrrellite: (Cu,Co,Ni)3Se4 Umangite: Cu3Se2
Comments: Bright metallic partial cubic tyrrellite crystal in altering umangite. Location: Eagle Claims, near Hal Lake, Beaverlodge, Saskatchewan, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tyuyamunite: Ca(UO2)2V2O8·5-8(H2O)
Comments: Yellow tyuyamunite crystals 1 mm in size. Location: Marie Mine, Carbon Co., Montana. USA. Scale: picture size 2 cm.. © John Veevaert