data_[Na2Tl6I8]
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
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [Pmmn]
_cell_length_a [6.9768]
_cell_length_b [10.8736]
_cell_length_c [10.8378]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [NaTl3I4]
_chemical_formula_sum '[Na2 Tl6 I8]'
_cell_volume [822.1918]
_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  0.0000  0.0000  0.8129  1.0
  Tl  Tl1  4  0.0000  0.2264  0.3421  1.0
  Tl  Tl2  2  0.0000  0.5000  0.8740  1.0
  I  I3  4  0.0000  0.2526  0.6702  1.0
  I  I4  2  0.0000  0.0000  0.1040  1.0
  I  I5  2  0.0000  0.5000  0.1976  1.0
]