AM_Fluorapatite_5 Formula: (Ca4.686 Sr.314) P3 O12 F Name: Fluorapatite Unit cell: 9.3902 9.3902 6.9011 90.0 90.0 120.0 , V=526.99 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.63