AM_Johnbaumite_1 Formula: Ca5 (As2.405 P.595) O13 H Name: Johnbaumite Unit cell: 9.6758 9.6758 6.9732 90.0 90.0 120.0 , V=565.37 Space group: P63/M (176)

Lee Y J , Stephens P W , Tang Y , Li W , Phillips B L , Parise J B , Reeder R J , American Mineralogist , 94 (2009) p.666-675, Arsenate substitution in hydroxylapatite: Structural characterization of the, Ca5(PxAs1-xO4)3OH solid solution, Sample: As80, Locality: synthetic