data_[Rb20Na8]
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
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [21.9967]
_cell_length_b [8.0964]
_cell_length_c [11.9255]
_cell_angle_alpha [90.0000]
_cell_angle_beta [98.6891]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [Rb5Na2]
_chemical_formula_sum '[Rb20 Na8]'
_cell_volume [2099.4933]
_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  8  0.1063  0.1711  0.9366  1.0
  Rb  Rb1  8  0.2206  0.3687  0.3230  1.0
  Rb  Rb2  4  0.0000  0.2932  0.2500  1.0
  Na  Na3  8  0.0893  0.3230  0.5857  1.0
]