data_[Si8P4Se2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  P  2.1900  1.0000  0.5500
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [4.5171]
_cell_length_b [4.5171]
_cell_length_c [14.9213]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Si4P2Se]
_chemical_formula_sum '[Si8 P4 Se2]'
_cell_volume [304.4547]
_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
[
  Si  Si0  4  0.0000  0.0000  0.2564  1
  Si  Si1  4  0.0000  0.5000  0.0000  1
  P  P2  4  0.0000  0.0000  0.4080  1
  Se  Se3  2  0.0000  0.0000  0.0000  1
]