Arthurite

arthurite

scorodite

pharmacosiderite

arsenopyrite

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Formula: CuFe3+2(AsO4)2(OH)2.4H2O
Hydrated arsenate containing hydroxyl
Specific gravity: 3.2
Hardness: 3 to 4
Colour: Apple-green, emerald-green, pale olive-green
Common impurities: P,S
Environments:

Hydrothermal environments

Arthurite is a rare secondary arsenic-bearing mineral in the oxidised zone of some copper deposits, formed by alteration of arsenopyrite or enargite, and associated with pharmacosiderite, scorodite, conichalcite, chenevixite, chalcophyllite, brochantite and quartz (HOM).

At the type locality, Hingston Down Consols, Cornwall, England, arthurite is associated with pharmacosiderite, scorodite, other phosphates and quartz (Dana).

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