Veenite

General Information: Chemical Formula:Pb2(Sb,As)2S5 Composition:(Molecular Weight = 776.08 gm)Antimony 17.26 % SbArsenic 8.69 % AsLead 53.40 % PbSulfur 20.66 % S  Empirical Formula: Pb2Sb1.1As0.9S5 IMA Status:Approved IMA 1967 Locality:Madoc, Ontario, Canada. Name Origin:Named for R. W. Van der Veen (1883-1925), Dutch economic geologist and metallographer.Physical Properties: Cleavage:None Color:steel gray. Density:5.92 Diaphaniety:Opaque Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., , Hardness:3.5-4 - Copper Penny-Flourite Luster:Metallic Streak:blackMore details...