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