data_[Na4Nb4Co2Se12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  Co  1.8800  1.3500  0.7683
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [6.2364]
_cell_length_b [11.0007]
_cell_length_c [7.5551]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.2090]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Nb2CoSe6]
_chemical_formula_sum '[Na4 Nb4 Co2 Se12]'
_cell_volume [502.4605]
_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  0.0000  0.1837  0.0000  1.0
  Nb  Nb1  4  0.0000  0.3632  0.5000  1.0
  Co  Co2  2  0.0000  0.0000  0.5000  1.0
  Se  Se3  8  0.2117  0.1654  0.6928  1.0
  Se  Se4  4  0.2394  0.0000  0.2701  1.0
]