data_[Rb1Na2Nb1Br8]
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
  Nb  1.6000  1.4500  0.8200
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P-1]
_cell_length_a [6.1493]
_cell_length_b [7.9626]
_cell_length_c [10.6529]
_cell_angle_alpha [68.7429]
_cell_angle_beta [77.9681]
_cell_angle_gamma [87.1114]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [RbNa2NbBr8]
_chemical_formula_sum '[Rb1 Na2 Nb1 Br8]'
_cell_volume [475.2659]
_cell_formula_units_Z [1]
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  1  0.0000  0.5000  0.5000  1.0
  Na  Na1  2  0.4301  0.9688  0.6850  1.0
  Nb  Nb2  1  0.0000  0.0000  0.0000  1.0
  Br  Br3  2  0.1225  0.9887  0.2220  1.0
  Br  Br4  2  0.2570  0.7444  0.9833  1.0
  Br  Br5  2  0.3006  0.2325  0.8507  1.0
  Br  Br6  2  0.4866  0.7175  0.5533  1.0
]