data_[Rb8Tl4Sb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tl  1.6200  1.9000  1.3325
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.8192]
_cell_length_b [5.8473]
_cell_length_c [12.5791]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.0175]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2TlSb2]
_chemical_formula_sum '[Rb8 Tl4 Sb8]'
_cell_volume [816.4250]
_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  0.0049  0.5000  0.6850  1
  Rb  Rb1  4  0.1851  0.5000  0.1014  1
  Tl  Tl2  4  0.2233  0.0000  0.3599  1
  Sb  Sb3  4  0.0155  0.0000  0.8949  1
  Sb  Sb4  4  0.1273  0.0000  0.5517  1
]