AM_Hydroxylapatite_17 Formula: Ca4.7 Na.1 Mg.02 P2.76 O12.09 H2 Name: Hydroxylapatite Unit cell: 9.4584 9.4584 6.8808 90.0 90.0 120.0 , V=533.10 Space group: P63/M (176)

Wilson R M , Elliot J C , Dowker S E P , American Mineralogist , 84 (1999) p.1406-1414, Rietveld refinement of the crystallographic structure of human dental, enamel apatites, Sample: RQ1 - enamel