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Formula: (Na,Ca,K)Cu3(AsO4)2Cl.5H2O
Arsenate
Crystal System: Tetragonal
Specific gravity: 3.33 measured, 3.36 calculated
Hardness: 2 to 3
Colour: Blue, emerald green
Environments
Localities
At the type locality, the Cap Garonne mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France, mahnertite is
found in the oxidised zone of an arsenic-rich
copper deposit. Associated minerals include
tennantite, covellite,
geminite, pushcharovskite
and quartz
(HOM).
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