data_Nb2AlPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.25
_cell_length_b   5.25
_cell_length_c   2.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   111.46
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Nb2AlPb
_chemical_formula_sum   'Nb2 Al1 Pb1'
_cell_volume   76.73
_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  Nb1  1  0.48  0.17  0.5  1.0
  Nb  Nb2  1  0.48  0.83  0.5  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Pb  Pb3  1  0.96  0.0  0.0  1.0

data_Nb2AlPb
_symmetry_space_group_name_H-M   Pm
_cell_length_a   5.25
_cell_length_b   2.99
_cell_length_c   5.25
_cell_angle_alpha   90.0
_cell_angle_beta   111.46
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   Nb2AlPb
_chemical_formula_sum   'Nb2 Al1 Pb1'
_cell_volume   76.73
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '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  0.48  0.5  0.17  1.0
  Nb  Nb1  1  0.48  0.5  0.83  1.0
  Al  Al2  1  0.0  0.0  0.0  1.0
  Pb  Pb3  1  0.96  0.0  0.0  1.0

Nb Nb Al Pb
Nb Nb Al Pb 0 1 o - o 2 3 - o o 