data_[Mg3Tl6Hg3I18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Tl  1.6200  1.9000  1.3325
  Hg  2.0000  1.5000  1.2450
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [8.2923]
_cell_length_b [8.2923]
_cell_length_c [23.7201]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [MgTl2HgI6]
_chemical_formula_sum '[Mg3 Tl6 Hg3 I18]'
_cell_volume [1412.5259]
_cell_formula_units_Z [3]
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
[
  Mg  Mg0  3  0.0000  0.0000  0.8111  1.0
  Tl  Tl1  3  0.0000  0.0000  0.0371  1.0
  Tl  Tl2  3  0.0000  0.0000  0.5136  1.0
  Hg  Hg3  3  0.0000  0.0000  0.2416  1.0
  I  I4  9  0.0327  0.4118  0.5792  1.0
  I  I5  9  0.0551  0.7045  0.4251  1.0
]