Zussmanite

General Information: Chemical Formula:K(Fe++,Mg,Mn)13[AlSi17O42](OH)14 Composition:(Molecular Weight = 2,147.17 gm)Potassium 1.82 % K Magnesium 1.13 % MgManganese 2.56 % MnAluminum 1.26 % AlIron 28.61 % FeSilicon 22.24 % SiHydrogen 0.66 % H Oxygen 41.73 % O  Empirical Formula: KFe2+11MgMn2+AlSi17O42(OH)14 Environment:Blue schist facies metamorphic rocks. IMA Status:Approved IMA 1966 Locality:Laytonville quarry, 5 miles south of Laytonville, Mendocino Co., California. Name Origin:Named for Jack Zussman (1924-), crystallographer and emeritus professor of geology, Manchester University, England.Physical Properties: Cleavage:[0001] Perfect Color:light green. Density:3.146 Diaphaniety:Translucent Luster:Vitreous (Glassy) Streak:whiteMore details...