data_[Nb4Se20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Nb  1.6000  1.4500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.5444]
_cell_length_b [14.6499]
_cell_length_c [12.6522]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [NbSe5]
_chemical_formula_sum '[Nb4 Se20]'
_cell_volume [656.9743]
_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
[
  Nb  Nb0  4  0.0000  0.2995  0.7500  1.0
  Se  Se1  8  0.0000  0.0868  0.1576  1.0
  Se  Se2  8  0.0000  0.2121  0.5634  1.0
  Se  Se3  4  0.0000  0.3353  0.2500  1.0
]