data_global _chemical_name_mineral 'Fluorapatite' loop_ _publ_author_name 'Hughes J M' 'Cameron M' 'Mariano A N' _journal_name_full 'American Mineralogist' _journal_volume 76 _journal_year 1991 _journal_page_first 1165 _journal_page_last 1173 _publ_section_title ; Rare-earth-element ordering and structural variations in natural rare-earth-bearing apatites sample from Kipawa, Quebec ; _database_code_amcsd 0001373 _chemical_formula_sum 'Ca4.641 Na.05 Ce.309 (P2.781 Si.219) O12 F' _cell_length_a 9.3908 _cell_length_b 9.3908 _cell_length_c 6.8988 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 526.877 _exptl_crystal_density_diffrn 3.364 _symmetry_space_group_name_H-M 'P 63/m' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x+y,-x,1/2-z' 'x-y,x,1/2+z' 'y,-x+y,-z' '-y,x-y,z' 'x,y,1/2-z' '-x,-y,1/2+z' 'x-y,x,-z' '-x+y,-x,z' '-y,x-y,1/2-z' 'y,-x+y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Ca1 0.66667 0.33333 0.00070 0.93600 0.01296 Na1 0.66667 0.33333 0.00070 0.02500 0.01296 Ce1 0.66667 0.33333 0.00070 0.03900 0.01296 Ca2 0.99123 0.24026 0.25000 0.92300 0.01289 Ce2 0.99123 0.24026 0.25000 0.07700 0.01289 P 0.36928 0.39832 0.25000 0.92700 0.00912 Si 0.36928 0.39832 0.25000 0.07300 0.00912 O1 0.48430 0.32610 0.25000 1.00000 0.01381 O2 0.46670 0.58750 0.25000 1.00000 0.01558 O3 0.25720 0.34170 0.07040 1.00000 0.01862 F 0.00000 0.00000 0.25000 1.00000 0.03420