Gamagarite

General Information: Chemical Formula:Ba2(Fe+++,Mn+++)(VO4)2(OH) Composition:(Molecular Weight = 577.16 gm)Barium 47.59 % BaManganese 2.38 % MnVanadium 17.65 % V Iron 7.26 % FeHydrogen 0.17 % H Oxygen 24.95 % O  Empirical Formula: Ba2Fe3+0.75Mn3+0.25(VO4)2(OH)Physical Properties: Cleavage:[001] Distinct, [100] Distinct, [101] Indistinct Color:brownish black, dark brown, or black. Density:4.62 Diaphaniety:Translucent to Opaque Hardness:4.5-5 Luster:AdamantineMore details...