AM_Apatite-(CaOH)_21 Formula: Ca5 (As.33 P2.67) O13 H Name: Apatite-(CaOH) Unit cell: 9.4655 9.4655 6.9068 90.0 90.0 120.0 , V=535.91 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: As11, Locality: synthetic