data_[Rb2Cu4I8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Cu  1.9000  1.3500  0.8200
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [P4_2/mmc]
_cell_length_a [7.7463]
_cell_length_b [7.7463]
_cell_length_c [10.4517]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [131]
_chemical_formula_structural [Rb(CuI2)2]
_chemical_formula_sum '[Rb2 Cu4 I8]'
_cell_volume [627.1556]
_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  2  0.5000  0.5000  0.2500  1.0
  Cu  Cu1  2  0.0000  0.0000  0.0000  1.0
  Cu  Cu2  2  0.0000  0.5000  0.0000  1.0
  I  I3  8  0.2367  0.2493  0.0000  1.0
]