data_[Rb4Cr2Fe4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  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 [14.9128]
_cell_length_b [3.8286]
_cell_length_c [8.1253]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.1183]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Cr(FeSe2)2]
_chemical_formula_sum '[Rb4 Cr2 Fe4 Se8]'
_cell_volume [438.3226]
_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
[
  Rb  Rb0  4  0.1309  0.0000  0.5525  1.0
  Cr  Cr1  2  0.0000  0.0000  0.0000  1.0
  Fe  Fe2  4  0.1922  0.5000  0.9764  1.0
  Se  Se3  4  0.0223  0.5000  0.7996  1.0
  Se  Se4  4  0.1879  0.0000  0.1746  1.0
]