General Information:
Chemical Formula:
(Cu,Ag)6PbS4
Composition:
(Molecular Weight = 761.06 gm)
Copper 41.75 % Cu
Silver 14.17 % Ag
Lead 27.23 % Pb
Sulfur 16.85 % S
Empirical Formula:
Cu5AgPbS4
IMA Status:
Approved IMA 1978
Locality:
Furutobe mine, Akita Prefecture, Japan.
Name Origin:
Named for the locality.
Physical Properties:
Color:
gray.
Density:
6.74
Diaphaniety:
Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
3 - Calcite
Luster:
Metallic
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