data_AlCuNi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.63
_cell_length_b   3.52
_cell_length_c   5.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCuNi2
_chemical_formula_sum   'Al1 Cu1 Ni2'
_cell_volume   47.09
_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
  Al  Al0  1  0.0  0.0  0.49  1.0
  Cu  Cu1  1  0.32  0.76  0.86  1.0
  Ni  Ni2  1  0.0  0.0  0.06  1.0
  Ni  Ni3  1  0.32  0.76  0.29  1.0

data_AlCuNi2
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.63
_cell_length_b   3.52
_cell_length_c   5.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCuNi2
_chemical_formula_sum   'Al1 Cu1 Ni2'
_cell_volume   47.09
_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
  Al  Al0  1  0.0  0.0  0.49  1.0
  Cu  Cu1  1  0.32  0.76  0.86  1.0
  Ni  Ni2  1  0.0  0.0  0.06  1.0
  Ni  Ni3  1  0.32  0.76  0.29  1.0

Al Cu Ni Ni
Al Cu Ni Ni 0 3 o - o 1 2 o + + 2 3 o - o 