data_[Na3Tl6As3I18]
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
  As  2.1800  1.1500  0.6600
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [8.4381]
_cell_length_b [8.4381]
_cell_length_c [20.5389]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaTl2AsI6]
_chemical_formula_sum '[Na3 Tl6 As3 I18]'
_cell_volume [1266.4750]
_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
[
  Na  Na0  3  0.0000  0.0000  0.8169  1.0
  Tl  Tl1  3  0.0000  0.0000  0.0272  1.0
  Tl  Tl2  3  0.0000  0.0000  0.5378  1.0
  As  As3  3  0.0000  0.0000  0.3241  1.0
  I  I4  9  0.0324  0.6126  0.0746  1.0
  I  I5  9  0.0888  0.3543  0.9107  1.0
]