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Studtite: [(UO2)O2(H2O)2](H2O)2 Billietite: Ba(UO2)6O4(OH)6·8(H2O)
Comments: Acicular, white sprays of studtite crystals on yellow, tabular billietite. Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals