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Terlinguacreekite: Hg++3O2Cl2
Comments: Reddish brown crystalline aggregates of eglestonite? or montroydite? in calcite matrix covered with yellow crusts of terlinguacreekite. Location: Mariposa Mine, Terlingua, Brewster County, Texas, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Terlinguaite: Hg+Hg++ClO
Comments: Beige, massive granular crystals of terlinguaite on pink calcite. Location: Mariposa mine, Terlingua, Terlingua district, Brewster Co., Texas, USA. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Ternesite: Ca5(SiO4)2SO4
Comments: Pale blue crystalline ternesite. Location: Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Terranovaite: (Na,Ca)8(Si68Al12)O160·29(H2O)
Comments: B&W image of terranovaite crystal. (AmMin, v82:423). Location: Jurassic Ferrar dolerites of Mt. Adamson, Northern Victoria Land, Antarctica. Scale: See Image. © American Mineralogist
Terskite: Na4ZrSi6O15(OH)2·2(H2O)
Comments: Pale violet terskite fragment. Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tertschite: Ca4B10O19·20(H2O)
Comments: Bright white fibrous powdery tertschite. Location: Kurtpinari Mine, Faras, Balikesir, Turkey. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Teruggite: Ca4MgAs2B12O22(OH)12·12(H2O)
Comments: Opaque rounded teruggite aggregate. Location: Loma Blanca, Jujuy, Argentina. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tetra-auricupride: AuCu
Comments: Golden brown crystals of tetra-auricupride on matrix. Location: Karabash (Karabasch), Chelyabinsk Oblast', Urals Region, Russia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Tetradymite: Bi2Te2S
Comments: Gray metallic foliated tetradymite in quartz. Location: Mangfallberg, Boliden, Vasterbotten, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tetraferriannite: K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2
Comments: Brownish black crystal fragment of tetraferriannite showing the micaceous cleavage. Location: Bancroft District, Hastings Co., Ontario, Canada. Scale: Sample Size 1 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Tetraferriphlogopite: KMg3Fe+++Si3O10(OH)2
Comments: Euhedral complete tabular crystal of dark brown tetraferriphlogopite with calcite, yellow-green apatite-(CaF), metallic chalcopyrite, and dark magnetite. Location: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Crystal Size 3.5x3x1.5 cm. © Pavel M. Kartashov
Tetraferroplatinum: PtFe
Comments: Tetraferroplatinum (dark grey) intergrown with, and rimmed by Pt-Fe alloy (bright) ranging in composition from Pt1.6Fe to Pt2.2Fe. (CanMin v43:1711). Location: PGM grains from stream sediments, Eastern Bushveld Complex, South Africa. Scale: See Image. © Canadian Mineralogist
Tetrahedrite: (Cu,Fe)12Sb4S13
Comments: A very brilliant tetrahedrite group with the tops of the crystals covered in chalcopyrite. Location: Casapalca, Lima, Peru. Scale: 8 x 6 cm. © Fabre Minerals
Comments: Bright sharp metallic tetrahedrite crystals to 1 cm in size on pinkish to colorless crystalline calcite matrix. Location: Cavnic (Kapnik), Maramures, Romania. Scale: 14 x 11 x 3 cm. © Dan Weinrich
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