data_global
_chemical_name_mineral 'Neighborite'
loop_
_publ_author_name
'Chakhmouradian A R'
'Ross K'
'Mitchell R H'
'Swainson I'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 28 
_journal_year 2001
_journal_page_first 277
_journal_page_last 284
_publ_section_title
;
 The crystal chemistry of synthetic potassium-bearing neighborite, (Na1-xKx)MgF3
 Sample studied by X-ray diffraction, x = .18
;
_database_code_amcsd 0008542
_chemical_formula_sum '(Na.82 K.18) Mg F3'
_cell_length_a 5.4486
_cell_length_b 5.5101
_cell_length_c 7.7623
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 233.042
_exptl_crystal_density_diffrn      3.055
_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_occupancy
_atom_site_U_iso_or_equiv
Na   0.99110   0.02440   0.25000   0.82000   0.02647
K   0.99110   0.02440   0.25000   0.18000   0.02647
Mg   0.00000   0.50000   0.00000   1.00000   0.01191
F1   0.07780   0.48310   0.25000   1.00000   0.01773
F2   0.70840   0.28760   0.02900   1.00000   0.02052