Fahleite

General Information: Chemical Formula:Zn5CaFe+++2(AsO4)6·14(H2O) Composition:(Molecular Weight = 1,564.45 gm)Calcium 2.56 % CaZinc 20.90 % ZnIron 7.14 % FeArsenic 28.73 % AsHydrogen 1.80 % H Oxygen 38.86 % O  Empirical Formula: Zn5CaFe3+2(AsO4)6·14(H2O) Environment:May be the Zn analog of smolianinovite. IMA Status:Approved IMA Locality:Tsumeb, Namibia. Name Origin:Named for Rolfe Fahle of Munich, Germany, a mineral dealer specializing in Tsumeb specimens.Physical Properties: Cleavage:[???] Perfect Color:gray, gray green, light green, or straw yellow. Density:2.1 - 3.16, Average = 2.63 Diaphaniety:Transparent Habits:Fibrous - Crystals made up of fibers., Aggregates - Made of numerous individual crystals or clusters., Hardness:2 - Gypsum Luster:Silky - PearlyMore details...

Zn5CaFe2(AsO4)6 14(H2O)