AM_Hydroxylapatite_7 Formula: Ca4.73 Na.1 Mg.05 P2.79 O11.99 H2 Name: Hydroxylapatite Unit cell: 9.4512 9.4512 6.8803 90.0 90.0 120.0 , V=532.25 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: RC7 - enamel