Babkinite

General Information: Chemical Formula:Pb2Bi2(S,Se)3 Composition:(Molecular Weight = 975.45 gm)Bismuth 42.85 % BiLead 42.48 % PbSelenium 8.09 % SeSulfur 6.57 % S  Empirical Formula: Pb2Bi2S2Se Environment:High temperature Sn-W sulfide deposits. IMA Status:Approved IMA 1994 Locality:The Nevskoye deposit in northeastern Russia, 400 km northwest of Magadan, 25 km northwest of Omskukchan and 35 km southwest of the Dukat gold-silver deposit. Name Origin:For P. V. Babkin (1929-1977), noted Russian Geologist and the first investigator of the Nevskoye deposit.Physical Properties: Cleavage:[001] Perfect Color:silvery gray. Density:8.09 Diaphaniety:Opaque Habits:Aggregates - Made of numerous individual crystals or clusters., Platy - Sheet forms (e.g. micas)., Hardness:2 - Gypsum Luster:Metallic Streak:grayMore details...