General Information:
Chemical Formula:NaCaCu5(AsO4)4Cl·5(H2O)
Composition:(Molecular Weight = 1,062.00 gm)Sodium 2.16 %
NaCalcium 3.77 %
CaCopper 29.92 %
CuArsenic 28.22 %
AsHydrogen 0.95 %
H Chlorine 3.34 %
ClOxygen 31.64 %
O Empirical Formula: NaCaCu5(AsO4)4Cl·5(H2O)
Environment:Secondary mineral in Cu-As deposits.
Locality:Jachimov, Bohemia, Czech Republic.
Name Origin:Named for the color (lavender blue).
Physical Properties: Cleavage:[010] Perfect, [110] Indistinct
Color:blue, lavender blue, or greenish blue.
Density:3.54
Diaphaniety:Translucent
Habits:Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Encrustations - Forms crust-like aggregates on matrix.,
Hardness:2.5 - Finger Nail
Luster:Vitreous - Waxy
Streak:light blue
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