Pharmacosiderite, Nevada
A nice specimen of green pharmacosiderite from the Majuba Hill Mine, Pershing County, Nevada.
Pharmacosiderite has a formula of KFe4(AsO4)3(OH4)•6H2O. The name is from the Greek, farmakon for "poison" and sideros for "iron."
Measures 2 1/2 x 2 x 1 inches.
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