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Stannomicrolite: (Sn++,Fe++,Mn++)(Ta,Nb,Sn++++)2(O,OH)7 Stokesite: CaSnSi3O9·2(H2O)
Comments: Stokesite "ball" composed of lath-like tan or clear crystals with several micro crystals of yellow stannomicrolite. Location: Urucum mine, Galileia, Minas Gerais, Brazil. Scale: 1.2 cm. © Tom Loomis / Dakota Matrix