Apatite-(CaF) Hughes J M, Cameron M, Mariano A N American Mineralogist 76 (1991) 1165-1173 Rare-earth-element ordering and structural variations in natural rare-earth-bearing apatites sample from Kipawa, Quebec _database_code_amcsd 0001378 9.3908 9.3908 6.8988 90 90 120 P6_3/m atom x y z occ Biso Ca1 2/3 1/3 .0007 .936 1.023 Na1 2/3 1/3 .0007 .025 1.023 Ce1 2/3 1/3 .0007 .039 1.023 Ca2 .99123 .24026 .25 .923 1.018 Ce2 .99123 .24026 .25 .077 1.018 P .36928 .39832 .25 .927 .72 Si .36928 .39832 .25 .073 .72 O1 .4843 .3261 .25 1.09 O2 .4667 .5875 .25 1.23 O3 .2572 .3417 .0704 1.47 F 0 0 .25 2.7