data_[K8Na4Mg4I20]
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 [Cmc2_1]
_cell_length_a [4.6421]
_cell_length_b [21.7682]
_cell_length_c [15.0069]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [K2NaMgI5]
_chemical_formula_sum '[K8 Na4 Mg4 I20]'
_cell_volume [1516.4554]
_cell_formula_units_Z [4]
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  4  0.0000  0.1311  0.3239  1.0
  K  K1  4  0.0000  0.1324  0.6832  1.0
  Na  Na2  4  0.0000  0.2132  0.0338  1.0
  Mg  Mg3  4  0.0000  0.4376  0.4267  1.0
  I  I4  4  0.0000  0.0427  0.0292  1.0
  I  I5  4  0.0000  0.2971  0.6754  1.0
  I  I6  4  0.0000  0.3164  0.3762  1.0
  I  I7  4  0.0000  0.3560  0.0056  1.0
  I  I8  4  0.0000  0.4992  0.2698  1.0
]