Platynite

General Information: Chemical Formula:(Bi,Pb)3(Se,S)4 Composition:(Molecular Weight = 894.11 gm)Bismuth 46.75 % BiLead 23.17 % PbSelenium 26.49 % SeSulfur 3.59 % S  Empirical Formula: Bi2PbSe3S Environment:Discredited as being a mixture of laitakarite and selenian galena. IMA Status:Discredited IMA 1999 Locality:Falun, Dalecarlia, Sweden. Name Origin:Named from the Greek "to broaden", in allusion to its platy habit.Physical Properties: Cleavage:[001] Good, [010] Good, [100] Good Color:gray, black, or white. Density:7.98 Diaphaniety:Opaque Habits:Platy - Sheet forms (e.g. micas)., , Hardness:2-3 - Gypsum-Calcite Luster:Metallic Streak:shining blackMore details...

PbBi2(Se,S)3