data_[Rb4Zn4Cr2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Zn  1.6500  1.3500  0.8800
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [16.7927]
_cell_length_b [3.9641]
_cell_length_c [7.7608]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.9636]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Zn2CrSe4]
_chemical_formula_sum '[Rb4 Zn4 Cr2 Se8]'
_cell_volume [494.1444]
_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  0.1229  0.0000  0.5331  1.0
  Zn  Zn1  4  0.1727  0.5000  0.9907  1.0
  Cr  Cr2  2  0.0000  0.0000  0.0000  1.0
  Se  Se3  4  0.0258  0.5000  0.8018  1.0
  Se  Se4  4  0.2183  0.0000  0.1898  1.0
]