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Formula: CoCu4(AsO4)2(AsO3OH)2.9H2O
Arsenate,
lindackerite group,
lindackerite supergroup,
cobalt-bearing mineral
Crystal System: Triclinic
Specific gravity: 3.33 measured, 3.17 calculated
Streak: White
Colour: Green
Luminescence: Not fluorescent under UV
Solubility: Soluble in hydrochloric acid
Environments
Sedimentary environments
Hydrothermal environments
Localities
At thr type locality, the Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France,
pradetite occurs as fibrous aggregates of individual very elongated crystals 0.3 mm x 0.05 mm x 0.15 mm, and
massive equidimensional grains ~ 0.2 mm in size. It is a
secondary alteration mineral, and is associated with
tennantite subgroup minerals,
quartz, olivenite,
covellite, chalcanthite and
antlerite
(Mindat).
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