data_[Na8Sr4Tl8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Tl  1.6200  1.9000  1.3325
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [4.0680]
_cell_length_b [5.2739]
_cell_length_c [31.4014]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Na2SrTl2]
_chemical_formula_sum '[Na8 Sr4 Tl8]'
_cell_volume [673.6985]
_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  0.2500  0.3091  1.0
  Na  Na1  4  0.0000  0.2500  0.7941  1.0
  Sr  Sr2  4  0.0000  0.2500  0.0747  1.0
  Tl  Tl3  4  0.0000  0.2500  0.5264  1.0
  Tl  Tl4  4  0.0000  0.2500  0.6263  1.0
]