Copiapite
From Wikipedia, the free encyclopedia
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 Copiapó, Atacama, Chile. It is sometimes known as yellow copperas
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