data_[Sn4Pb4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sn  1.9600  1.4500  0.8300
  Pb  2.3300  1.8000  1.1225
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [6.2175]
_cell_length_b [4.4026]
_cell_length_c [19.1401]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [SnPbSe2]
_chemical_formula_sum '[Sn4 Pb4 Se8]'
_cell_volume [523.9289]
_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
[
  Sn  Sn0  4  0.2277  0.2500  0.8359  1.0
  Pb  Pb1  4  0.2461  0.7500  0.5670  1.0
  Se  Se2  4  0.2364  0.7500  0.1681  1.0
  Se  Se3  4  0.2491  0.2500  0.4319  1.0
]