Hydroxylapatite Fleet M E, Liu X, King P L American Mineralogist 89 (2004) 1422-1432 Accommodation of the carbonate ion in apatite: An FTIR and X-ray structure study of crystals synthesized at 2-4 GPa Sample: xt374 _database_code_amcsd 0003641 9.4468 9.4468 6.8806 90 90 120 P6_3/m atom x y z occ Uiso Ca1 2/3 1/3 .0018 .0156 Ca2 .99268 .24830 .25 .0158 P .3689 .3993 .25 .0130 O1 .4845 .3287 .25 .0151 O2 .4649 .5862 .25 .0234 O3 .2587 .3435 .0710 .0285 O4 0 0 .1949 .5 .035 H 0 0 .53 .65 .035 C 0 0 0 .01 .025 OA12 .944 .126 .527 .012 .025