Nagelschmidtite

General Information: Chemical Formula:Ca7(SiO4)3(PO4)2 Composition:(Molecular Weight = 746.74 gm)Calcium 37.57 % CaSilicon 11.28 % SiPhosphorus 8.30 % P Oxygen 42.85 % O  Empirical Formula: Ca7(SiO4)3(PO4)2 Environment:Sedimentary phosphate deposits. IMA Status:Approved IMA 1977 Locality:Lowermost portion of the Hatrarum formation, Israel. Name Origin:Named for G. Nagelschmidt, who first described the synthetic compound in 1937.Physical Properties: Cleavage:[001] Good Color:brown, colorless, yellowish white, or light yellow. Density:3.065 Diaphaniety:Transparent Habits:Anhedral Grains - Granular minerals without the expression of crystal shapes, , Luster:Vitreous (Glassy) Streak:whiteMore details...

Ca3(PO4)2 2(Ca2SiO4)