General Information:
Chemical Formula:Pb6(Ag,Cu)2As4S13
Composition:(Molecular Weight = 2,153.32 gm)Copper 1.48 %
CuSilver 7.51 %
AgArsenic 13.92 %
AsLead 57.73 %
PbSulfur 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
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