Paraguanajuatite

General Information:
 Chemical Formula:
Bi2(Se,S)3
 Composition:
(Molecular Weight = 691.82 gm)
Bismuth 60.41 % Bi
Selenium 25.68 % Se
Sulfur 13.91 % S 
 Empirical Formula:
Bi2Se2.25S3
Physical Properties:
 Cleavage:
[0001] Perfect
 Color:
lead gray or yellowish white.
 Density:
6.6
 Diaphaniety:
Opaque
 Hardness:
2.5-3 - Finger Nail-Calcite
 Luster:
Metallic
 Streak:
gray
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