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Walpurgite: Bi4(UO2)(AsO4)2O4·2(H2O)
Comments: Clear, yellow laths of walpurgite crystals. Location: Schneesberg, Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Elongated, pale yellow, triclinic crystalline aggregate of walpurgite on calcite. Location: Walpurgis Flacher vein, Weißer Hirsch Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Crystal size 1 cm. © Paul M. Schumacher