AM_Hydroxylapatite_13 Formula: Ca4.76 Na.1 Mg.02 P2.82 O12.25 H1.62 Name: Hydroxylapatite Unit cell: 9.4554 9.4554 6.8835 90.0 90.0 120.0 , V=532.97 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: RGP - enamel