General Information:
Chemical Formula:
(Na,Ca)Cu++3(AsO4)2Cl·5(H2O)
Composition:
(Molecular Weight = 621.27 gm)
Sodium 2.78 % Na
Calcium 1.61 % Ca
Copper 30.69 % Cu
Arsenic 24.12 % As
Hydrogen 1.62 % H
Chlorine 5.71 % Cl
Oxygen 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 Musum 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)
More details...