AM_Fluorapatite_6 Formula: (Ca4.852 Sr.148) P3 O12 F.89 Name: Fluorapatite Unit cell: 9.3786 9.3786 6.8922 90.0 90.0 120.0 , V=525.01 Space group: P63/M (176)

Hughes J M , Cameron M , Crowley K D , American Mineralogist , 76 (1991) p.1857-1862, Ordering of divalent cations in the apatite structure: Crystal structure, refinements of natural Mn- and Sr-bearing apatite, sample Sr.29