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: As11 Locality: synthetic _database_code_amcsd 0004925 9.4655 9.4655 6.9068 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00130 .744 Ca2 .24660 .99367 .25 .744 As .39655 .36850 .25 .1101 .744 P .39655 .36850 .25 .8899 .744 O1 .32514 .48279 .25 .744 O2 .58587 .46366 .25 .744 O3 .34162 .25584 .06850 .744 OH4 0 0 .6939 .5 .744