cobalt mineral

Formula: Co3(AsO4)2.8H2O arsenate, vivianite group
Specific gravity: 3.07
Hardness: 2
Streak: Pink
Colour: Red
Solubility: Insoluble in water, nitric and sulphuric acid; soluble in hydrochloric acid

Hydrothermal environments

Erythrite is a rare secondary mineral that occurs in the oxidation zone of some Ni-Co-As mineral deposits as an alteration product of cobalt arsenides. It is rarely present in large amounts and usually forms as crusts or fine aggregates filling cracks.

Common impurities: Ni,Fe,Zn

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