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: As24 Locality: synthetic _database_code_amcsd 0004926 9.5075 9.5075 6.9187 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00150 .826 Ca2 .24615 .99407 .25 .826 As .39641 .36822 .25 .2423 .826 P .39641 .36822 .25 .7577 .826 O1 .32208 .48537 .25 .826 O2 .58686 .46258 .25 .826 O3 .34056 .25558 .06641 .826 OH4 0 0 .6946 .5 .826