data_[Na4Cu12Sn8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.9861]
_cell_length_b [3.8450]
_cell_length_c [9.6539]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.8227]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaCu3Sn2]
_chemical_formula_sum '[Na4 Cu12 Sn8]'
_cell_volume [485.2410]
_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  0.1333  0.0000  0.9920  1.0
  Cu  Cu1  4  0.0670  0.0000  0.4315  1.0
  Cu  Cu2  4  0.0681  0.5000  0.6269  1.0
  Cu  Cu3  4  0.1977  0.5000  0.5039  1.0
  Sn  Sn4  4  0.0553  0.5000  0.2176  1.0
  Sn  Sn5  4  0.2149  0.0000  0.7219  1.0
]