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Pharmacosiderite: KFe+++4(AsO4)3(OH)4·6-7(H2O) Arthurite: CuFe+++2(AsO4,PO4,SO4)2(O,OH)2·4(H2O)
Comments: Altered rhyolite vug lined with brilliant apple green arthurite and cubic green crystals of pharmacosiderite.
Location: Majuba Hill Mine, Pershing County, Nevada. USA.
Scale: 2.7 x 1.7 cm.
© John Veevaert
Comments: Translucent yellow-brown cubic Pharmacosiderite crystals.
Location: Wheal Gorland, Saint Day, Cornwall, England.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species