Parkerite

General Information:
 Chemical Formula:
Ni3(Bi,Pb)2S2
 Composition:
(Molecular Weight = 657.27 gm)
Nickel 26.79 % Ni
Bismuth 47.69 % Bi
Lead 15.76 % Pb
Sulfur 9.76 % S 
 Empirical Formula:
Ni3Bi1.5Pb0.5S2
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
bronze brown or bronze.
 Density:
8.4
 Diaphaniety:
Opaque
 Hardness:
2 - Gypsum
 Luster:
Metallic
 Streak:
metallic
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