Hedyphane

General Information: Chemical Formula:Ca2Pb3(AsO4)3Cl Composition:(Molecular Weight = 1,153.97 gm)Calcium 6.95 % CaArsenic 19.48 % AsLead 53.87 % PbChlorine 3.07 % ClOxygen 16.64 % O  Empirical Formula: Pb3Ca2(AsO4)3Cl IMA Status:Accepted IMA 1972 Locality:Langban, Varmland, Sweden. Name Origin:From the Greek hedy - "beautifully bright," in allusion to the high luster.Physical Properties: Cleavage:[1011] Imperfect Color:blue, gray white, yellowish white, or white. Density:5.8 - 5.82, Average = 5.81 Diaphaniety:Translucent Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Hardness:4-5 - Fluorite-Apatite Luminescence:Weakly Fluorescent, Short UV=light yellow, Long UV=light yellow. Luster:Adamantine - Resinous Streak:whiteMore details...