data_[K8Se12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmc2_1]
_cell_length_a [7.6835]
_cell_length_b [10.7455]
_cell_length_c [7.7430]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [K2Se3]
_chemical_formula_sum '[K8 Se12]'
_cell_volume [639.2848]
_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  0.0979  0.3703  1.0
  K  K1  4  0.0000  0.4118  0.1503  1.0
  Se  Se2  8  0.2483  0.1600  0.9997  1.0
  Se  Se3  4  0.0000  0.2079  0.8178  1.0
]