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Truscottite: (Ca,Mn++)14Si24O58(OH)8·2(H2O)
Comments: Whitish pearly scaly massive truscottite. Location: Lebong Donok Mine, Benkeelen, Sumatra Island, Indonesia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tsaregorodtsevite: N(CH3)4AlSi5O12
Comments: Translucent tsaregorodtsevite crystals, with small quartz crystals, on mica schist. Location: Near Mount Yaruta, Man-Khambo Range, Republic of Komi, Near-Polar Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tschermakite: [ ]Ca2(Mg3AlFe+++)Si6Al2O22(OH)2
Comments: Dark green tschermakite with compact divergent structure. Location: Elba, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tsugaruite: Pb4As2S7
Comments: Brown-gray fibrous spherical tsugaruite on matrix. Location: Yunosawa Mine, Aomori, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tsumoite: BiTe
Comments: Gray metallic tsumoite in milky quartz. Location: Biorkdalsgruvan, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tungstenite: WS2
Comments: Tungstenite, variety tungstenite-2H, gray metallic flakes in rock. Location: Rita, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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