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Formula: NaFe3+(SO4)2.6H2O
Hydrated sulphate
Crystal System: Monoclinic
Specific gravity: 2.19 to 2.2 measured, 2.22 calculated
Hardness: 2½ to 3
Colour: Pale yellow with a greenish tint
Solubility: Soluble in water, astringent taste
Environments
Amarillite forms in the oxidation zones of sulphide deposits, commonly associated with
coquimbite
(Mindat).
Localities
At the type locality, Tierra Amarilla, Copiapó Province, Atacama, Chile, amarillite occurs in veinlets in
massive coquimbite
(Dana).
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