General Information:
Chemical Formula:
Pb7Ag2(Sb,Bi)8S20
Composition:
(Molecular Weight = 3,455.92 gm)
Silver 6.24 % Ag
Bismuth 12.09 % Bi
Antimony 21.14 % Sb
Lead 41.97 % Pb
Sulfur 18.56 % S
Empirical Formula:
Pb7Ag2Sb6Bi2S20
Locality:
Poorman Mine, Silver City district, Owyhee Co., Idaho.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Perfect
Color:
lead gray, gray blue, yellowish, or silver gray.
Density:
6.22 - 6.51, Average = 6.36
Diaphaniety:
Opaque
Habits:
Acicular - Occurs as needle-like crystals., Massive - Fibrous - Distinctly fibrous fine-grained forms., Fibrous - Crystals made up of fibers.
Hardness:
2.5 - Finger Nail
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
reddish brown
More details...