data_[Rb4Na8Tl12]
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 [12.9433]
_cell_length_b [11.2344]
_cell_length_c [6.1623]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [RbNa2Tl3]
_chemical_formula_sum '[Rb4 Na8 Tl12]'
_cell_volume [896.0512]
_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  4  0.0000  0.3090  0.2500  1.0
  Na  Na1  8  0.2154  0.0000  0.0000  1.0
  Tl  Tl2  8  0.1925  0.2646  0.7500  1.0
  Tl  Tl3  4  0.0000  0.0848  0.7500  1.0
]