General Information:
Chemical Formula:
Pb6(Ag,Cu)2As4S13
Composition:
(Molecular Weight = 2,153.32 gm)
Copper 1.48 % Cu
Silver 7.51 % Ag
Arsenic 13.92 % As
Lead 57.73 % Pb
Sulfur 19.36 % S
Empirical Formula:
Pb6Ag1.5Cu0.5As4S13
Locality:
Lengenbach quarry, Binnental, Valais, Switzerland.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Perfect
Color:
gray blue or steel gray.
Density:
5.8 - 5.85, Average = 5.82
Diaphaniety:
Opaque
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
1-2 - Between Talc and Gypsum
Luster:
Metallic
Streak:
black
More details...