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Formula: NaCo4(SO4)(OH)6Cl.6H2O
Valence: NaCo2+4(S6+O4)(OH)6Cl.6H2O
Hydrated sulphate, namuwite group,
cobalt-bearing mineral
Crystal system: Trigonal
Specific gravity: 2.52 measured, 2.48 calculated
Hardness: 1½ to 2
Streak: Light pink
Colour: Pink to light pink
Luminescence: No fluorescence under UV
Solubility: Soluble in hydrochloric acid
Environments
Localities
At the type locality, Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France, thérèsemagnanite
occurs as pink to light pink, thin platy crystals, making up radiating spherules to 0.2 mm across. Crystals are transparent,
with a pearly lustre, light pink streak and one perfect cleavage. It is a
secondary alteration mineral associated with
quartz gangue and
anglesite, antlerite,
ktenasite, cerussite,
brochantite, covellite,
tennantite and gersdorffite
(AM 78.1315).
Thérèsemagnanite from Cap Garonne - Image
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