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 Pajarito, New Mexico _database_code_amcsd 0001377 9.4052 9.4052 6.9125 90 90 120 P6_3/m atom x y z occ Biso Ca1 2/3 1/3 -.0012 .677 .986 Na1 2/3 1/3 -.0012 .237 .986 Ce1 2/3 1/3 -.0012 .086 .986 Ca2 .98860 .23885 .25 .847 .885 Ce2 .98860 .23885 .25 .153 .885 P .36881 .39692 .25 .947 .63 Si .36881 .39692 .25 .053 .63 O1 .4821 .3233 .25 1.14 O2 .4671 .5853 .25 1.35 O3 .2557 .3396 .0721 1.65 F 0 0 .25 2.50