data_global _chemical_name_mineral 'Neighborite' loop_ _publ_author_name 'Chen J' 'Liu H' 'Martin C D' 'Parise J B' 'Weidner D J' _journal_name_full 'American Mineralogist' _journal_volume 90 _journal_year 2005 _journal_page_first 1534 _journal_page_last 1539 _publ_section_title ; Crystal chemistry of NaMgF3 perovskite and high pressure and temperature Sample: P = 4 GPa, T = 200 C ; _database_code_amcsd 0003925 _chemical_formula_sum 'Na Mg F3' _cell_length_a 5.3047 _cell_length_b 5.4282 _cell_length_c 7.5864 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 218.450 _exptl_crystal_density_diffrn 3.171 _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 0.98560 0.04550 0.25000 0.03600 Mg 0.00000 0.50000 0.00000 0.01400 F1 0.08700 0.46690 0.25000 0.01800 F2 0.69510 0.29560 0.04810 0.03300