data_[Rb2Tl12Hg8]
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
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [I-42m]
_cell_length_a [8.5207]
_cell_length_b [8.5207]
_cell_length_c [10.9161]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [121]
_chemical_formula_structural [Rb(Tl3Hg2)2]
_chemical_formula_sum '[Rb2 Tl12 Hg8]'
_cell_volume [792.5255]
_cell_formula_units_Z [2]
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  2  0.0000  0.0000  0.0000  1
  Tl  Tl1  8  0.1436  0.1436  0.6305  1
  Tl  Tl2  4  0.0000  0.5000  0.0000  1
  Hg  Hg3  8  0.2229  0.2229  0.3586  1
]