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Takedaite: Ca3(BO3)2
Comments: Translucent granular takedaite. Location: Fuka, Okayama, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Takeuchiite: Mg2Mn+++O2(BO3)
Comments: Aggregates of black prismatic takeuchiite crystals. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Takovite: Ni6Al2(OH)16(CO3,OH)·4(H2O)
Comments: Aqua-colored takovite on rock. Location: Carr-Boyd Nickel Mine, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Talmessite: Ca2Mg(AsO4)2·2(H2O)
Comments: Translucent nearly colorless talmessite microcrystals. Location: Old Gold Hill Mine, Tooele County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Talnakhite: Cu9(Fe,Ni)8S16
Comments: Tarnished brown talnakhite with brassy chalcopyrite. Location: Talnakh Deposit, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Taneyamalite: (Na,Ca)(Mn++,Mg)12[(Si,Al)6O17]2(O,OH)10
Comments: Dark brown silky fibrous taneyamalite vein in manganese ore. Location: Taneyama Mine, Toyo, Kumamoto, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tantalaeschynite-(Y): (Y,Ce,Ca)(Ta,Ti,Nb)2O6
Comments: Nearly pure fragment of tantalaeschynite-(Y). Location: Raposa Pegmatite, São José do Sabugi, Paraíba, Northeast Region, Brazil. Scale: Specimen Size 1 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Tantalcarbide: TaC
Comments: Dark gray metallic tantalcarbide grains in sand. Location: Nizhnii Tagil Massif, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tantalite-(Fe): Fe++Ta2O6
Comments: Rounded black crystal of ferrotantalite. Location: Mount Surprise, Queensland, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tanteuxenite-(Y): (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6
Comments: Irregular fragment of tanteuxenite-(Y). Location: Liha, Maniema, Democratic Republic of Congo (Zaïre). Scale: Specimen Size 1.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species