General Information:
Chemical Formula:
NaCaCu5(AsO4)4Cl·5(H2O)
Composition:
(Molecular Weight = 1,062.00 gm)
Sodium 2.16 % Na
Calcium 3.77 % Ca
Copper 29.92 % Cu
Arsenic 28.22 % As
Hydrogen 0.95 % H
Chlorine 3.34 % Cl
Oxygen 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
More details...