data_[Nb4Cu2Se12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Nb  1.6000  1.4500  0.8200
  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 [13.8458]
_cell_length_b [3.4084]
_cell_length_c [11.3316]
_cell_angle_alpha [90.0000]
_cell_angle_beta [124.2474]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Nb2CuSe6]
_chemical_formula_sum '[Nb4 Cu2 Se12]'
_cell_volume [442.0436]
_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
[
  Nb  Nb0  4  0.1785  0.5000  0.2898  1.0
  Cu  Cu1  2  0.0000  0.0000  0.0000  1.0
  Se  Se2  4  0.0085  0.0000  0.2175  1.0
  Se  Se3  4  0.1605  0.5000  0.5216  1.0
  Se  Se4  4  0.2121  0.0000  0.1415  1.0
]