data_[Rb4Tl8Hg4O4]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4cm]
_cell_length_a [7.2184]
_cell_length_b [7.2184]
_cell_length_c [11.3662]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [108]
_chemical_formula_structural [RbTl2HgO]
_chemical_formula_sum '[Rb4 Tl8 Hg4 O4]'
_cell_volume [592.2384]
_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  0.0000  0.2570  1
  Tl  Tl1  8  0.1895  0.3105  0.9923  1
  Hg  Hg2  4  0.0000  0.5000  0.2408  1
  O  O3  4  0.0000  0.0000  0.0178  1
]