data_[Rb2Na2Cu4Br8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [I222]
_cell_length_a [7.2542]
_cell_length_b [8.3048]
_cell_length_c [8.8565]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [23]
_chemical_formula_structural [RbNa(CuBr2)2]
_chemical_formula_sum '[Rb2 Na2 Cu4 Br8]'
_cell_volume [533.5589]
_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  0.0000  0.0000  0.0000  1
  Na  Na1  2  0.0000  0.0000  0.5000  1
  Cu  Cu2  4  0.0000  0.5000  0.1475  1
  Br  Br3  8  0.2385  0.3248  0.8187  1
]