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 neutron diffraction, x = .5
 One of two alternative models
;
_database_code_amcsd 0008543
_chemical_formula_sum '(Na.5 K.5) Mg F3'
_cell_length_a 5.566
_cell_length_b 5.566
_cell_length_c 3.953
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 122.465
_exptl_crystal_density_diffrn      3.047
_symmetry_space_group_name_H-M 'P 4/m b m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,z'
  '1/2+y,1/2+x,-z'
  'y,-x,-z'
  '-y,x,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  'x,y,-z'
  '-x,-y,z'
  '1/2+y,1/2+x,z'
  '1/2-y,1/2-x,-z'
  '-y,x,-z'
  'y,-x,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   0.00000   0.50000   0.50000   0.50000   0.01393
K   0.00000   0.50000   0.50000   0.50000   0.01393
Mg   0.00000   0.00000   0.00000   1.00000  -0.00633
F1   0.00000   0.00000   0.50000   1.00000   0.02495
F2   0.25960   0.75960   0.00000   1.00000   0.02482