data_[K2Na2Mg2Br8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.3934]
_cell_length_b [7.6356]
_cell_length_c [8.9031]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.5979]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KNaMgBr4]
_chemical_formula_sum '[K2 Na2 Mg2 Br8]'
_cell_volume [481.6686]
_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
[
  K  K0  2  0.2360  0.2500  0.0527  1.0
  Na  Na1  2  0.2163  0.2500  0.5570  1.0
  Mg  Mg2  2  0.2506  0.7500  0.3266  1.0
  Br  Br3  4  0.0136  0.5019  0.2738  1.0
  Br  Br4  2  0.4475  0.7500  0.1407  1.0
  Br  Br5  2  0.4699  0.7500  0.5956  1.0
]