Kempite

General Information: Chemical Formula:Mn2Cl(OH)3 Composition:(Molecular Weight = 196.35 gm)Manganese 55.96 % MnHydrogen 1.54 % H Chlorine 18.06 % ClOxygen 24.45 % O  Empirical Formula: Mn2+2Cl(OH)3 Environment:Oxidized portions of manganese deposits. Locality:Alum Rock Park, 7 miles NE of San Jose, Santa Clara Co. California.Physical Properties: Cleavage:None Color:emerald green. Density:2.94 Diaphaniety:Translucent to Opaque Habits:Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Hardness:3.5 - Copper Penny Luminescence:Non-fluorescent. Streak:light greenMore details...