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Phosphowalpurgite: (UO2)Bi4(PO4)O4·2(H2O)
Comments: Scanning electron photomicrograph of tabular crystals (up to 330 microm) of phosphowalpurgite, (CanMin, 42:966).. Location: Old mine dumps of an abandoned small ore deposit near Smrkovec, located 10 km NNE of Mariánské Lázn?, Slavkovský Les Mountains, western Bohemia, Czech Republic. Scale: Picture Size 515 µ-m. © Canadian Mineralogist