General Information:
Chemical Formula:
NaPbCu++5(AsO4)4Cl·5(H2O)
Composition:
(Molecular Weight = 1,229.13 gm)
Sodium 1.87 % Na
Copper 25.85 % Cu
Arsenic 24.38 % As
Hydrogen 0.82 % H
Lead 16.86 % Pb
Chlorine 2.88 % Cl
Oxygen 27.34 % O
Empirical Formula:
NaPbCu5(AsO4)4Cl·5(H2O)
Environment:
In a tennantite-bearing horizon near the contact with a lead-bearing horizon in pillars 78, 78b, and 80 in the northern part of the mine.
IMA Status:
Approved IMA
Locality:
The Cap Garonne mine, near Le Pradet, 12 km east of Toulon, Var, France.
Name Origin:
For Dr. Johan Zdenek (1935-), mineralogist and Director of Scientific Affairs of the Bureau de Recherches Geologiques et Minieres, France.
Physical Properties:
Cleavage:
[001] Perfect
Color:
blue or turquoise.
Density:
4.1
Diaphaniety:
Translucent
Habits:
Tabular - Form dimensions are thin in one direction., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
pale blue
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