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Calciouranoite: (Ca,Ba,Pb)U2O7·5(H2O) Metacalciouranoite: (Ca,Na,Ba)U2O7·2(H2O)
Comments: Cryptocrystalline looking, greasy yellow blotches, of amorphous calciouranoite (probably, in part, dehydrated to matacalciouranoite). Location: Oktyabr'skoye Mo-U deposit, east Transbaikal region, Russia. Scale: See Image. © Rruff Database