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