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Arthurite: CuFe+++2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) Pharmacosiderite: KFe+++4(AsO4)3(OH)4·6-7(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: Radiating sprays of acicular arthurite.
Location: Majuba Hill mine, Pershing County, Nevada, USA.
Scale: Spray size 2.5 mm.
© Tom Loomis / Dakota Matrix