Arthurite is a rare copper iron arsenate.
It is typically green and forms small acicular crystals.
Specimens from the classic mines of Cornwall, England are often associated with other rare minerals such
as
Arthurite lends its name to a small group of rather obscure minerals called the Arthurite Group. The Arthurite Group is a group of monoclinic, hydrated iron arsenates and phosphates with a general formula of XFe2(AO4)2(O, OH)2 - 2H2O The X in the formula can be either copper, iron, manganese and/or zinc. The A in the formula can be either arsenic or phosphorous.
These are the members of the Arthurite Group:
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