Nasonite

General Information: Chemical Formula:Pb6Ca4Si6O21Cl2 Composition:(Molecular Weight = 1,978.92 gm)Calcium 8.10 % CaSilicon 8.52 % SiLead 62.82 % PbChlorine 3.58 % ClOxygen 16.98 % O  Empirical Formula: Pb6Ca4Si6O21Cl2 Environment:Metamorphosed Mn-Zn deposit. Locality:Franklin, Sussex Co., New Jersy, USA. Name Origin:Named for Frank Lewis Nason (1856-1928), American geologist, Geological Survey of New Jersey.Physical Properties: Cleavage:[???] Good Color:white. Density:5.5 Diaphaniety:Transparent to translucent Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Cleaveable - Easily cleaved into fragments., Hardness:4 - Fluorite Luminescence:Non-fluorescent. Luster:Vitreous - Adamantine Streak:whiteMore details...