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Chervetite: Pb2V2O7 Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Comments: Bottle brown tabular crystals of chervetite on yellow francevilleite. Location: Mounana, Haut-Ogoue, Gabon. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals