General Information:
Chemical Formula:
Pb2As2S5
Composition:
(Molecular Weight = 724.57 gm)
Arsenic 20.68 % As
Lead 57.19 % Pb
Sulfur 22.13 % S
Empirical Formula:
Pb2As2S5
Locality:
Binnental, Valais, Switzerland.
Physical Properties:
Cleavage:
[010] Perfect
Color:
lead gray, gray, or steel gray.
Density:
5.55 - 5.57, Average = 5.56
Diaphaniety:
Subtranslucent to opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
3 - Calcite
Luster:
Sub Metallic
Streak:
red brown
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