Eskimoite

General Information:
 Chemical Formula:
Ag7Pb10Bi15S36
 Composition:
(Molecular Weight = 7,116.16 gm)
Silver 10.61 % Ag
Bismuth 44.05 % Bi
Lead 29.12 % Pb
Sulfur 16.22 % S 
 Empirical Formula:
Ag7Pb10Bi15S36
 IMA Status:
Approved IMA 1977
 Locality:
Ivigutut, Greenland.
 Name Origin:
Named for the Eskimos, the natives of Greenland.
Physical Properties:
 Color:
black or gray.
 Density:
7.1
 Diaphaniety:
Opaque
 Habits:
Lamellar - Thin laminae producing a lamellar structure., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
 Hardness:
4 - Fluorite
 Luster:
Metallic
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