data_[Na4Sr2Pb12]
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
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [3.6393]
_cell_length_b [9.1104]
_cell_length_c [17.7101]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Na2SrPb6]
_chemical_formula_sum '[Na4 Sr2 Pb12]'
_cell_volume [587.1804]
_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  4  0.0000  0.5000  0.1458  1.0
  Sr  Sr1  2  0.0000  0.0000  0.0000  1.0
  Pb  Pb2  8  0.0000  0.3217  0.3239  1.0
  Pb  Pb3  4  0.0000  0.1726  0.5000  1.0
]