Vikingite

General Information: Chemical Formula:Ag5Pb8Bi13S30 Composition:(Molecular Weight = 5,875.67 gm)Silver 9.18 % AgBismuth 46.24 % BiLead 28.21 % PbSulfur 16.37 % S  Empirical Formula: Ag5Pb8Bi13S30 IMA Status:Approved IMA 1977 Locality:Ivigtut, Greenland. Name Origin:Named for the Vikings, who settled Greenland in the tenth century.Physical Properties: Color:gray. Density:6.94 Diaphaniety:Opaque Habits:Microscopic Crystals - Crystals visible only with microscopes., Lamellar - Thin laminae producing a lamellar structure., Hardness:3.5 - Copper Penny Luster:MetallicMore details...