data_Nb3Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.2
_cell_length_b   8.2
_cell_length_c   8.2
_cell_angle_alpha   23.07
_cell_angle_beta   23.07
_cell_angle_gamma   23.07
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Nb3Se
_chemical_formula_sum   'Nb3 Se1'
_cell_volume   74.34
_cell_formula_units_Z   1
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  1  0.0  0.0  0.04  1.0
  Nb  Nb1  1  0.0  0.0  0.97  1.0
  Nb  Nb2  1  0.0  0.0  0.9  1.0
  Se  Se3  1  0.0  0.0  0.0  1.0

data_Nb3Se
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.68
_cell_length_b   3.28
_cell_length_c   8.2
_cell_angle_alpha   90.0
_cell_angle_beta   103.35
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Nb3Se
_chemical_formula_sum   'Nb6 Se2'
_cell_volume   148.67
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.03  1.0
  Nb  Nb1  2  0.0  0.0  0.1  1.0
  Nb  Nb2  2  0.0  0.0  0.96  1.0
  Se  Se3  2  0.0  0.0  0.0  1.0

Nb Nb Nb Se