General Information:
Chemical Formula:Pb7Ag2(Sb,Bi)8S20
Composition:(Molecular Weight = 3,455.92 gm)Silver 6.24 %
AgBismuth 12.09 %
BiAntimony 21.14 %
SbLead 41.97 %
PbSulfur 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
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