General Information:
Chemical Formula:
PbCuAsS3
Composition:
(Molecular Weight = 441.87 gm)
Copper 14.38 % Cu
Arsenic 16.96 % As
Lead 46.89 % Pb
Sulfur 21.77 % S
Empirical Formula:
PbCuAsS3
Environment:
Forms a series with bournonite.
Locality:
Lengenbach quarry, Binnental, Valais, Switzerland.
Name Origin:
Named for Gustav Seligman (1849-1920), German mineral collector.
Physical Properties:
Cleavage:
[???] Indistinct
Color:
lead gray, dark lead gray, or black.
Density:
5.38 - 5.44, Average = 5.41
Diaphaniety:
Opaque
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Twinning Common - Crystals are usually twinned.,
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
chocolate brown
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