data_[K4Sn2I8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Sn  1.9600  1.4500  0.8300
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [6.2513]
_cell_length_b [6.2513]
_cell_length_c [18.0929]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [K2SnI4]
_chemical_formula_sum '[K4 Sn2 I8]'
_cell_volume [707.0479]
_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  4  0.0000  0.0000  0.3646  1.0
  Sn  Sn1  2  0.0000  0.0000  0.0000  1.0
  I  I2  4  0.0000  0.0000  0.1743  1.0
  I  I3  4  0.0000  0.5000  0.0000  1.0
]