Hydroxylapatite Lee Y J, Stephens P W, Tang Y, Li W, Phillips B L, Parise J B, Reeder R J American Mineralogist 94 (2009) 666-675 Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution Sample: As43 Locality: synthetic _database_code_amcsd 0004927 9.5640 9.5640 6.9360 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00332 1.033 Ca2 .24560 .99521 .25 1.033 As .39666 .36810 .25 .4325 1.033 P .39666 .36810 .25 .5675 1.033 O1 .31891 .48632 .25 1.033 O2 .59069 .46372 .25 1.033 O3 .34097 .25623 .06362 1.033 OH4 0 0 .6929 .5 1.033