Parisite-(Nd)

General Information: Chemical Formula:Ca(Nd,Ce,La)2(CO3)3F2 Composition:(Molecular Weight = 555.09 gm)Calcium 7.22 % CaLanthanum 20.02 % LaCerium 10.10 % CeCarbon 6.49 % C Neodymium 23.39 % NdOxygen 25.94 % O Fluorine 6.85 % F  Empirical Formula: CaNd0.9Ce0.4La0.8(CO3)3F2 IMA Status:Not Approved Locality:Bayan Obo iron-rare earth deposit, Inner Mongolia, China. Name Origin:Named as the Nd-rich end member of the parisite series, named for J. J. Paris, mine proprietor at Muzon, norht of Bogota, Columbia.Physical Properties: Cleavage:[???] Good Color:brownish yellow. Density:4.2 - 4.5, Average = 4.34 Diaphaniety:Transparent Hardness:4-5 - Fluorite-Apatite Luster:Vitreous (Glassy) Streak:whiteMore details...