Giessenite

General Information:
 Chemical Formula:
2(Cu2Pb26(Bi,Sb)20S57)
 IMA Status:
Approved IMA 1963
Physical Properties:
 Color:
grayish black.
 Density:
7.45
 Diaphaniety:
Opaque
 Hardness:
2.5 - Finger Nail
 Luster:
Metallic
 Streak:
grayish black
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