data_global _chemical_name_mineral 'Carbonate-fluorapatite' loop_ _publ_author_name 'Perdikatsis B' _journal_name_full 'Materials Science Forum' _journal_volume 79 _journal_year 1991 _journal_page_first 809 _journal_page_last 814 _publ_section_title ; X-ray powder diffraction study of francolite by the Rietveld method Sample: T = 530 C Note: Reported structure does not reproduce reported formula or bondlengths ; _database_code_amcsd 0014386 _chemical_compound_source 'Epirus, Greece' _chemical_formula_sum 'Ca2.07 P1.239 O8.922 F.163' _cell_length_a 9.3230 _cell_length_b 9.3230 _cell_length_c 6.8987 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 519.289 _exptl_crystal_density_diffrn 1.709 _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 0.33333 0.66667 0.00160 0.31800 0.01440 Ca2 0.24030 0.98970 0.25000 0.47800 0.00940 P 0.39990 0.37160 0.25000 0.41300 0.00897 O1 0.32780 0.48250 0.25000 0.46100 0.00979 O2 0.58520 0.46540 0.25000 0.51300 0.02270 O3 0.34350 0.25950 0.06770 1.00000 0.02623 F 0.00000 0.00000 0.25000 0.16300 0.02230