AM_Fluorapatite_2 Formula: Ca3.895 Na.474 Ce.631 (P2.841 Si.159) O12 F Name: Fluorapatite Unit cell: 9.4052 9.4052 6.9125 90.0 90.0 120.0 , V=529.54 Space group: P63/M (176)

Hughes J M , Cameron M , Mariano A N , American Mineralogist , 76 (1991) p.1165-1173, Rare-earth-element ordering and structural variations in natural, rare-earth-bearing apatites, sample from Pajarito, New Mexico