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: As0 Locality: synthetic _database_code_amcsd 0004924 9.4212 9.4212 6.8927 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00097 .542 Ca2 .24642 .99283 .25 .542 P .39717 .36792 .25 .542 O1 .32694 .48259 .25 .542 O2 .58687 .46621 .25 .542 O3 .34163 .25520 .06978 .542 OH4 0 0 .1978 .5 .542