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Formula: Fe3+0.67Fe3+4(SO4)6(OH)2.20H2O
Hydrated sulphate containing hydroxyl, copiapite group
Crystal System: Triclinic
Specific gravity: 2.14 measured, 2.14 calculated
Hardness: 2½ to 3
Streak: Light yellow
Colour: Yellow, yellow-orange
Solubility: Soluble in water
Environments
Ferricopiapite is a secondary mineral formed typically
by the weathering and oxidation of iron sulphide in a wide range of rock types, preserved in arid climates. It is
associated with pyrite
(HOM).
Localities
The type locality is Atacama, Chile.
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