Copper World

Arthurite

IMA formula: CuFe3+2(AsO4)2(OH)2(H2O)4 

Crystallography: Monoclinic. P21/c. a = 10.102(8) Å, b = 9.625(4) Å, c = 5.548(4) Å, β = 92.2(1)°. Z = 2.

Specimen #114. Arthurite (green), scorodite (pale blue), and pharmacosiderite (bluish transparent cubes). Majuba Hill Mine, Antelope Mining District, Pershing County, Nevada, USA. FOV 4.4 mm.