data_[Na4Nb4Tl8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  Tl  1.6200  1.9000  1.3325
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [11.5945]
_cell_length_b [9.4432]
_cell_length_c [6.8765]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.4079]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaNbTl2O6]
_chemical_formula_sum '[Na4 Nb4 Tl8 O24]'
_cell_volume [680.0791]
_cell_formula_units_Z [4]
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  4  0.0000  0.1873  0.2500  1
  Nb  Nb1  4  0.0000  0.1638  0.7500  1
  Tl  Tl2  8  0.1754  0.4698  0.2040  1
  O  O3  8  0.0930  0.2770  0.9890  1
  O  O4  8  0.1130  0.0464  0.6919  1
  O  O5  8  0.1392  0.3861  0.4523  1
]