data_[Na4Sn4Se6]
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
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [7.8923]
_cell_length_b [8.4220]
_cell_length_c [7.7426]
_cell_angle_alpha [90.0000]
_cell_angle_beta [118.9736]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2Sn2Se3]
_chemical_formula_sum '[Na4 Sn4 Se6]'
_cell_volume [450.2312]
_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  0.3770  0.6173  0.7807  1.0
  Sn  Sn1  4  0.0720  0.1648  0.7048  1.0
  Se  Se2  4  0.2747  0.5690  0.1065  1.0
  Se  Se3  2  0.0000  0.0000  0.0000  1.0
]