data_[Na4Mg2Cl8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.6272]
_cell_length_b [3.8713]
_cell_length_c [7.1307]
_cell_angle_alpha [90.0000]
_cell_angle_beta [118.3036]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2MgCl4]
_chemical_formula_sum '[Na4 Mg2 Cl8]'
_cell_volume [331.2121]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Na  Na0  4  0.2032  0.5000  0.6870  1.0
  Mg  Mg1  2  0.0000  0.0000  0.0000  1.0
  Cl  Cl2  4  0.1076  0.0000  0.3880  1.0
  Cl  Cl3  4  0.1281  0.5000  0.9934  1.0
]