Madocite

General Information: Chemical Formula:Pb17(Sb,As)16S41 Composition:(Molecular Weight = 6,841.29 gm)Antimony 24.91 % SbArsenic 4.38 % AsLead 51.49 % PbSulfur 19.22 % S  Empirical Formula: Pb17Sb14As4S41 IMA Status:Approved IMA 1967 Locality:Madoc, Ontario, Canada. Name Origin:Named for the locality.Physical Properties: Cleavage:[010] Perfect Color:grayish black. Density:5.98 Diaphaniety:Opaque Habits:Crystalline - Fine - Occurs as well-formed fine sized crystals., , Hardness:3 - Calcite Luster:Metallic Streak:grayish blackMore details...