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Chalcophyllite: Cu++18Al2(AsO4)3(SO4)3(OH)27·33(H2O)
Comments: Altered rhyolite vug lined with chalcophyllite crystals. The largest crystal is 0.5 cm across and several have the perfect "stop sign" hexagon form. Location: Majuba Hill Mine, Pershing County, Nevada, USA. Scale: Picture size 2 cm. © John Veevaert