data_[Na2Sn6Pb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sn  1.9600  1.4500  0.8300
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Pmmn]
_cell_length_a [4.8359]
_cell_length_b [10.1121]
_cell_length_c [9.6066]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [NaSn3Pb4]
_chemical_formula_sum '[Na2 Sn6 Pb8]'
_cell_volume [469.7685]
_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  0.6155  1
  Sn  Sn1  4  0.0000  0.2550  0.3888  1
  Sn  Sn2  2  0.0000  0.5000  0.6231  1
  Pb  Pb3  4  0.0000  0.2469  0.8686  1
  Pb  Pb4  2  0.0000  0.0000  0.1366  1
  Pb  Pb5  2  0.0000  0.5000  0.1347  1
]