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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
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
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
Uhligite: Ca3(Ti,Al,Zr)9O20
Comments: Black granular uhligite in syenite rock. Location: near Lake Magadi, Rift Valley Province, Kenya. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Uklonskovite: NaMg(SO4)F·2(H2O)
Comments: Minute crystals and crystalline uklonskovite. Location: Pampa del Pique III, Antofagasta, Chile. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ulrichite: CaCu(UO2)(PO4)2·4(H2O)
Comments: Green ulrichite microcrystal tuft on quartz. Location: Lake Boga, Victoria, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ulvospinel: TiFe++2O4
Comments: Black sub-metallic massive ulvöspinel. Location: Otanmaki, Sout, Oulu, Finland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Umangite: Cu3Se2 Berzelianite: Cu2Se
Comments: Black massive umangite intergrown with dark blue metallic berzelianite. Location: Borsov, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Umbozerite: Na3Sr4ThSi8(O,OH)24
Comments: Dark brown prismatic umbozerite masses in pegmatite rock. Location: Pegmatite #100, Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk District,. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species