data_NbCrB2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.12
_cell_length_b   3.12
_cell_length_c   4.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NbCrB2
_chemical_formula_sum   'Nb1 Cr1 B2'
_cell_volume   42.9
_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  Nb3  1  0.56  0.56  0.0  1.0
  Cr  Cr2  1  0.0  0.0  0.2  1.0
  B  B0  1  0.0  0.0  0.0  1.0
  B  B1  1  0.56  0.56  0.2  1.0

data_NbCrB2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.42
_cell_length_b   4.42
_cell_length_c   4.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NbCrB2
_chemical_formula_sum   'Nb2 Cr2 B4'
_cell_volume   85.81
_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  0.06  0.5  0.0  1.0
  Cr  Cr1  2  0.0  0.0  0.2  1.0
  B  B2  2  0.0  0.0  0.0  1.0
  B  B3  2  0.06  0.5  0.2  1.0

Nb Cr B B
Nb Cr B B 0 3 o o o 1 2 o o o 
NbBCrB is Tetraauricupride structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two chromium boride (crb) molecules and two niobium boride (nbb) molecules.