data_[Rb2Na2Cu2Br8]
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 [P2_1/m]
_cell_length_a [7.3071]
_cell_length_b [6.8891]
_cell_length_c [9.3234]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.3351]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbNaCuBr4]
_chemical_formula_sum '[Rb2 Na2 Cu2 Br8]'
_cell_volume [448.0147]
_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  0.2674  0.7500  0.0656  1.0
  Na  Na1  2  0.2509  0.7500  0.5630  1.0
  Cu  Cu2  2  0.2164  0.2500  0.3221  1.0
  Br  Br3  4  0.0121  0.0074  0.7246  1.0
  Br  Br4  2  0.4123  0.2500  0.1501  1.0
  Br  Br5  2  0.4330  0.2500  0.5725  1.0
]