data_[Tl4Ga2Hg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tl  1.6200  1.9000  1.3325
  Ga  1.8100  1.3000  0.7600
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [I-42m]
_cell_length_a [6.6028]
_cell_length_b [6.6028]
_cell_length_c [9.1516]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [121]
_chemical_formula_structural [Tl2GaHg4]
_chemical_formula_sum '[Tl4 Ga2 Hg8]'
_cell_volume [398.9872]
_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
[
  Tl  Tl0  4  0.0000  0.5000  0.0000  1.0
  Ga  Ga1  2  0.0000  0.0000  0.0000  1.0
  Hg  Hg2  8  0.1782  0.1782  0.7331  1.0
]