Akrochordite

General Information: Chemical Formula:Mn4Mg(AsO4)2(OH)4·4(H2O) Composition:(Molecular Weight = 661.99 gm)Magnesium 3.67 % MgManganese 33.20 % MnArsenic 22.64 % AsHydrogen 1.83 % H Oxygen 38.67 % O  Empirical Formula: Mn4+4Mg(AsO4)2(OH)4·4(H2O) Locality:TL: Sweden, V„rmland, Filipstad, L†ngban mnPhysical Properties: Cleavage:[???] Good Color:reddish brown. Density:3.19 - 3.26, Average = 3.22 Diaphaniety:Translucent Hardness:3.5 - Copper PennyMore details...