data_global _chemical_name_mineral 'Neighborite' loop_ _publ_author_name 'Knight K S' _journal_name_full 'American Mineralogist' _journal_volume 99 _journal_year 2014 _journal_page_first 824 _journal_page_last 838 _publ_section_title ; A high-resolution powder neutron diffraction study of the crystal structure of neighborite (NaMgF3) between 9 and 440 K Note: T = 9 K ; _database_code_amcsd 0020172 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Na Mg F3' _cell_length_a 5.32517 _cell_length_b 5.47795 _cell_length_c 7.62732 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 222.497 _exptl_crystal_density_diffrn 3.113 _symmetry_space_group_name_H-M 'P b n m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Na 0.08750 0.54970 0.25000 0.00498 Mg 0.00000 0.00000 0.00000 0.00045 F1 0.09310 0.96990 0.25000 0.00205 F2 0.29816 0.20414 0.95143 0.00258