Whitmoreite

General Information: Chemical Formula:Fe++Fe+++2(PO4)2(OH)2·4(H2O) Composition:(Molecular Weight = 463.56 gm)Iron 36.14 % FePhosphorus 13.36 % P Hydrogen 2.17 % H Oxygen 48.32 % O  Empirical Formula: Fe2+Fe2+2(PO4)2(OH)2·4(H2O) IMA Status:Approved IMA 1974Physical Properties: Cleavage:[100] Good Color:brown, greenish brown, light yellow brown, or dark brown. Density:2.87 Diaphaniety:Transparent to Translucent Hardness:3 - Calcite Luster:Vitreous - AdamantineMore details...

Fe3(PO4)2(OH)2 4(H2O)