Gatumbaite

General Information: Chemical Formula:CaAl2(PO4)2(OH)2·(H2O) Composition:(Molecular Weight = 336.01 gm)Calcium 11.93 % CaAluminum 16.06 % AlPhosphorus 18.44 % P Hydrogen 1.20 % H Oxygen 52.38 % O  Empirical Formula: CaAl2(PO4)2(OH)2·(H2O) IMA Status:Approved IMA 1977 Locality:Buranga pegmatite, near Gatumba, Gisenyi Province, Rwanda. Name Origin:Named for the locality.Physical Properties: Cleavage:[???] Good, [???] Good Color:white. Density:2.92 Diaphaniety:Translucent Habits:Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat., Rosette - Bundled tabular aggregates resembling rose flower petals., Scaly - Morphology like fish scales. Hardness:4-5 - Fluorite-Apatite Luminescence:Non-fluorescent. Luster:Pearly Streak:whiteMore details...