data_[Na4Y2Cu4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Y  1.2200  1.8000  1.0400
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [14.7016]
_cell_length_b [3.9309]
_cell_length_c [7.6183]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.3270]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Y(CuSe2)2]
_chemical_formula_sum '[Na4 Y2 Cu4 Se8]'
_cell_volume [407.2583]
_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  0.1265  0.0000  0.5623  1.0
  Y  Y1  2  0.0000  0.0000  0.0000  1.0
  Cu  Cu2  4  0.1844  0.5000  0.9922  1.0
  Se  Se3  4  0.0165  0.5000  0.7455  1.0
  Se  Se4  4  0.2120  0.0000  0.2036  1.0
]