Johnbaumite 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: As80 Locality: synthetic _database_code_amcsd 0004929 9.6758 9.6758 6.9732 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00330 .765 Ca2 .24625 .99780 .25 .765 As .39681 .36909 .25 .8015 .765 P .39681 .36909 .25 .1985 .765 O1 .31603 .48819 .25 .765 O2 .59366 .46606 .25 .765 O3 .33941 .25085 .05944 .765 OH4 0 0 .6971 .5 .765