data_[Cr4Fe2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cr  1.6600  1.4000  0.9400
  Fe  1.8300  1.4000  0.8525
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.9952]
_cell_length_b [3.6929]
_cell_length_c [6.3877]
_cell_angle_alpha [90.0000]
_cell_angle_beta [119.2097]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Cr2FeSe4]
_chemical_formula_sum '[Cr4 Fe2 Se8]'
_cell_volume [267.5649]
_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
[
  Cr  Cr0  4  0.2443  0.5000  0.7607  1.0
  Fe  Fe1  2  0.0000  0.0000  0.0000  1.0
  Se  Se2  4  0.1220  0.0000  0.7914  1.0
  Se  Se3  4  0.1303  0.5000  0.2952  1.0
]