Apatite-(CaOH) Wilson R M, Elliot J C, Dowker S E P American Mineralogist 84 (1999) 1406-1414 Rietveld refinement of the crystallographic structure of human dental enamel apatites Sample: RFB - enamel _database_code_amcsd 0002307 9.4586 9.4586 6.8811 90 90 120 P6_3/m atom x y z occ Ca1 2/3 1/3 .0026 .97 Na1 2/3 1/3 .0026 .02 Mg1 2/3 1/3 .0026 .01 Ca2 .2460 .9899 .25 .94 Na2 .2460 .9899 .25 .02 P .3991 .3694 .25 .95 O1 .3337 .4875 .25 .91 O2 .5804 .4600 .25 .97 O3 .3414 .2579 .0704 .90 Oh 0 0 .1803 .50 H 0 0 .0608 .89