Weissbergite

General Information:
 Chemical Formula:
TlSbS2
 Composition:
(Molecular Weight = 390.27 gm)
Thallium 52.37 % Tl
Antimony 31.20 % Sb
Sulfur 16.43 % S 
 Empirical Formula:
TlSbS2
 IMA Status:
Approved IMA 1978
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
steel gray.
 Density:
5.79
 Diaphaniety:
Opaque
 Hardness:
1.5 - Between Talc and Gypsum
 Luster:
Metallic
 Streak:
reddish gray
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