Ustarasite

General Information:
 Chemical Formula:
Pb(Bi,Sb)6S10
 Locality:
Ustarasaisk deposit, western Tian-Shan, Kazakhstan.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
gray or silver gray.
 Diaphaniety:
Opaque
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
 Hardness:
2.5 - Finger Nail
 Luster:
Metallic
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