data_[Na2Tl2Hg2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Tl  1.6200  1.9000  1.3325
  Hg  2.0000  1.5000  1.2450
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.7551]
_cell_length_b [6.0106]
_cell_length_c [7.5179]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.2261]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaTlHgF4]
_chemical_formula_sum '[Na2 Tl2 Hg2 F8]'
_cell_volume [278.3661]
_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
[
  Na  Na0  2  0.3691  0.7500  0.5208  1.0
  Tl  Tl1  2  0.2952  0.2500  0.9748  1.0
  Hg  Hg2  2  0.0701  0.2500  0.3331  1.0
  F  F3  4  0.3165  0.0251  0.2954  1.0
  F  F4  2  0.0063  0.2500  0.6001  1.0
  F  F5  2  0.2901  0.7500  0.8153  1.0
]