General Information:
Chemical Formula:Cu9Ag5HgS8
Composition:(Molecular Weight = 1,568.37 gm)Copper 36.47 %
CuSilver 34.39 %
AgMercury 12.79 %
HgSulfur 16.36 %
S Empirical Formula: Cu9Ag5HgS8
IMA Status:Approved IMA 1973
Locality:Sedmochislenitsi mine, Vratsa district, Balkan Mountains, Bulgaria.
Name Origin:Named for the locality.
Physical Properties: Cleavage:None
Color:gray or steel gray.
Density:6.318
Diaphaniety:Opaque
Habits:Microscopic Crystals - Crystals visible only with microscopes., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:3.5 - Copper Penny
Luster:Metallic
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