Copiapite

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A sample of copiapite
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A sample of copiapite

Copiapite is a hydrated iron sulfate mineral with formula: Fe2+Fe3+4(SO4)6(OH)2·20(H2O).

Copiapite forms in the weathering or oxidation zone of sulfide deposits in arid climates. It is soluble in water.

Copiapite was first described in 1833 for an occurrence near Copiapo, Atacama, Chile. It is sometimes known as yellow copperas

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