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Trevorite: NiFe+++2O4 Willemseite: (Ni,Mg)3Si4O10(OH)2
Comments: Waxy translucent green willemseite with black trevorite in schistose rock. Location: Near Scotia Talc Mine, Barberton Mountain, Transvaal, Mpumalanga, South Africa. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Small trevorite crystal in massive willemseite. Location: Bon Accord, Barberton Mountain, Mpumalanga, South Africa. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Triangulite: Al3(UO2)4(PO4)4(OH)5·5(H2O)
Comments: Bright yellow triangulite filling vugs in rhyolite. Location: Rhyolite Ridge, near Mina, Mineral County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tridymite: SiO2
Comments: Clear, pseudohexagonal crystals of tridymite on matrix. Location: Bellerberg quarry, Laacher See, Rhineland-Palatinate, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Trilithionite: KLi1.5Al1.5AlSi3O10F2
Comments: Pinkish trilithionite in matrix. Location: Neuland Quarry, Döbschütz, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Trimerite: CaMn2Be3(SiO4)3
Comments: Pinkish crystalline trimerite in ore. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Trinitite: Lechatelierite: SiO2
Comments: Fused silica sand (trinitite) generated by the first nuclear (fission) bomb. Although man-made and not a valid mineral, the specimen has historic value. Location: Trinity Flats, White Sands, New Mexico. It came into existance at 5:29 a.m., July 16, 1945. Scale: Specimen size 4.1 cm. © Paul M. Schumacher
Triphylite: LiFe++PO4
Comments: Dark gray-blue prismatic triphylite crystals in pegmatite rock. Location: Newry, Oxford County, Maine, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Triplite: (Mn,Fe++,Mg,Ca)2(PO4)(F,OH)
Comments: Dark brown vitreous triplite. Location: Abravazes Pegmatite, Beira Alta, Viseu, Portugal. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Triploidite: (Mn,Fe++)2(PO4)(OH) Lithiophilite: LiMnPO4
Comments: Salmon-colored prismatic crystalline triploidite with brown lithiophilite. Location: Capoeira Mine, near Parelhas, Rio Grande do Norte, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species