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Uraninite: UO2
Comments: Black uraninite impregnating coaly wood fragments. You can see the woody structure in detail preserved in the uraninite. Location: Grants mineral district, Westwater Canyon Member of the Morrison Formation.. Scale: Picture size 5 mm. © Paul M. Schumacher
Uraninite: UO2 Uranophane: Ca(UO2)2SiO3(OH)2·5(H2O)
Comments: Sharp, cubic crystals of black uraninite on yellow uranophane. Location: Teofilo Otoni, Minas Gerais, Brazil. Scale: Picture size 1.5 mm. © Paul M. Schumacher
Comments: Polished slab of black "gummite" ore with the uraninite altering to various secondary uranium minerals in a brecciated matrix. Location: Ruggles mine, Graton, New Hampshire, USA. Scale: Specimen size 11.4 cm. © Paul M. Schumacher