data_[K2Na2Mg2I8]
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
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.8857]
_cell_length_b [8.3243]
_cell_length_c [9.5077]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.4026]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KNaMgI4]
_chemical_formula_sum '[K2 Na2 Mg2 I8]'
_cell_volume [598.7046]
_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  0.2231  0.2500  0.0519  1
  Na  Na1  2  0.2274  0.2500  0.5643  1
  Mg  Mg2  2  0.2436  0.7500  0.3227  1
  I  I3  4  0.0038  0.0002  0.2701  1
  I  I4  2  0.4415  0.7500  0.1299  1
  I  I5  2  0.4668  0.7500  0.5986  1
]