data_NbGa2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.55
_cell_length_b   5.55
_cell_length_c   5.55
_cell_angle_alpha   139.65
_cell_angle_beta   139.65
_cell_angle_gamma   58.39
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NbGa2Se
_chemical_formula_sum   'Nb1 Ga2 Se1'
_cell_volume   71.01
_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  Nb2  1  0.0  0.0  0.84  1.0
  Ga  Ga0  1  0.91  0.0  0.42  1.0
  Ga  Ga1  1  0.0  0.91  0.42  1.0
  Se  Se3  1  0.0  0.0  0.0  1.0

data_NbGa2Se
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.41
_cell_length_b   5.41
_cell_length_c   5.55
_cell_angle_alpha   90.0
_cell_angle_beta   119.19
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NbGa2Se
_chemical_formula_sum   'Nb2 Ga4 Se2'
_cell_volume   142.03
_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  0.16  1.0
  Ga  Ga1  4  0.46  0.46  0.49  1.0
  Se  Se2  2  0.0  0.0  0.0  1.0

Nb Ga Ga Se
NbSe(Ga)2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two digallane molecules and two selanylideneniobium molecules.