Giniite

General Information: Chemical Formula:Fe++Fe+++4(PO4)4(OH)2·2(H2O) Composition:(Molecular Weight = 729.17 gm)Iron 38.30 % FePhosphorus 16.99 % P Hydrogen 0.83 % H Oxygen 43.88 % O  Empirical Formula: Fe2+Fe3+4(PO4)4(OH)2·2(H2O) Environment:In a pegmatite. Locality:Sandamab, near Usakos, Namibia. Name Origin:Named by Paul Keller for his wife, Gini Keller.Physical Properties: Cleavage:None Color:blackish brown, black, or blackish green. Density:3.41 Diaphaniety:Translucent Habits:Crystalline - Fine - Occurs as well-formed fine sized crystals., , Hardness:3-4 - Calcite-Fluorite Luster:Vitreous - Greasy Streak:olive greenMore details...