Nevskite

General Information:
 Chemical Formula:
Bi(Se,S)
 Composition:
(Molecular Weight = 276.22 gm)
Bismuth 75.66 % Bi
Selenium 21.44 % Se
Sulfur 2.90 % S 
 Empirical Formula:
BiSe0.75S0.25
Physical Properties:
 Cleavage:
[0001] Perfect
 Color:
lead gray.
 Density:
7.85
 Diaphaniety:
Opaque
 Hardness:
3 - Calcite
 Luster:
Metallic
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