data_[Rb20Na8Tl4]
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
  Tl  1.6200  1.9000  1.3325
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [5.0536]
_cell_length_b [15.4337]
_cell_length_c [26.3519]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Rb5Na2Tl]
_chemical_formula_sum '[Rb20 Na8 Tl4]'
_cell_volume [2055.3430]
_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  0.0000  0.0937  0.1177  1
  Rb  Rb1  8  0.0000  0.3626  0.0481  1
  Rb  Rb2  4  0.0000  0.4884  0.2500  1
  Na  Na3  8  0.0000  0.2145  0.6825  1
  Tl  Tl4  4  0.0000  0.2074  0.2500  1
]