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Formula: Na2Cu(SO4)2.2H2O
Hydrated normal sulphate, roselite group
Specific gravity: 2.90
Hardness: 2½ to 3
Streak: White
Colour: Blue, greenish blue; light blue to colourless in transmitted light
Solubility: Soluble in water
Environments
Kröhnkite is an uncommon secondary mineral formed in the
oxidised zone of copper deposits, typically in very arid climates
(HOM).
Localities
At the type locality, the Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile,
kröhnkite is associated with atacamite,
blödite, chalcanthite,
antlerite and natrochalcite
(HOM).
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