data_[Rb4Cr4Cu4Se12]
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
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.7491]
_cell_length_b [15.7189]
_cell_length_c [9.8885]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [RbCrCuSe3]
_chemical_formula_sum '[Rb4 Cr4 Cu4 Se12]'
_cell_volume [582.7431]
_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
[
  Rb  Rb0  4  0.0000  0.2534  0.2500  1.0
  Cr  Cr1  4  0.0000  0.5000  0.0000  1.0
  Cu  Cu2  4  0.0000  0.0336  0.7500  1.0
  Se  Se3  8  0.0000  0.1088  0.5412  1.0
  Se  Se4  4  0.0000  0.4357  0.7500  1.0
]