Owyheeite

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 brownMore details...

Ag2Pb7(Sb,Bi)8S20