General Information:
Chemical Formula:(Na,Ca)Cu++3(AsO4)2Cl·5(H2O)
Composition:(Molecular Weight = 621.27 gm)Sodium 2.78 %
NaCalcium 1.61 %
CaCopper 30.69 %
CuArsenic 24.12 %
AsHydrogen 1.62 %
H Chlorine 5.71 %
ClOxygen 33.48 %
O Empirical Formula: Na0.75Ca0.25Cu3(AsO4)2Cl·5(H2O)
Environment:Found in a zone of secondary alteration.
IMA Status:Approved IMA
Locality:Cap Garonne mine, Var, France.
Name Origin:Named after Volker Mahnert (b. 1943), zoologist, director of the Musâum d'Histoire Naturelle, Geneva, Switzerland.
Physical Properties: Color:blue or emerald green.
Density:3.33
Diaphaniety:Translucent
Hardness:2-3 - Gypsum-Calcite
Luster:Vitreous (Glassy)
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