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: As100 Locality: synthetic _database_code_amcsd 0004930 9.7156 9.7156 6.9857 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .00267 1.271 Ca2 .24746 .99831 .25 1.271 As .39816 .37008 .25 1.271 O1 .31975 .49033 .25 1.271 O2 .59742 .46823 .25 1.271 O3 .33588 .24509 .05623 1.271 OH4 0 0 .1919 .5 1.271