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Calciopetersite: CaCu6[(PO4)2(PO3OH)(OH)6]·3(H2O)
Comments: SEM image of calciopetersite in fine radiating spray; note the hexagonal outline of crystals. (CanMin, v43:1393). Location: Domasiov nad Bystrici, Czech Republic. Scale: See Image. © J. Sejkora / Canadian Mineralogist