Hammarite

General Information:
 Chemical Formula:
Pb2Cu2Bi4S9 (?)
 Composition:
(Molecular Weight = 1,666.01 gm)
Copper 7.63 % Cu
Bismuth 50.18 % Bi
Lead 24.87 % Pb
Sulfur 17.32 % S 
 Empirical Formula:
Pb2Cu2Bi4S9
 Locality:
Gladhammer, Province of Kalmar, Sweden.
 Name Origin:
Named after its locality.
Physical Properties:
 Cleavage:
[010] Good
 Color:
reddish steel gray.
 Density:
6.73
 Diaphaniety:
Opaque
 Habits:
Acicular - Occurs as needle-like crystals., ,
 Hardness:
3-4 - Calcite-Fluorite
 Luster:
Metallic
 Streak:
black
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