data_Cu2NiHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.57
_cell_length_b   4.57
_cell_length_c   2.84
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   108.45
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2NiHg
_chemical_formula_sum   'Cu2 Ni1 Hg1'
_cell_volume   56.29
_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
  Cu  Cu0  1  0.34  0.86  0.42  1.0
  Cu  Cu1  1  0.34  0.14  0.42  1.0
  Ni  Ni3  1  0.0  0.0  0.0  1.0
  Hg  Hg2  1  0.67  0.0  0.0  1.0

data_Cu2NiHg
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.84
_cell_length_b   4.57
_cell_length_c   4.57
_cell_angle_alpha   108.45
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2NiHg
_chemical_formula_sum   'Cu2 Ni1 Hg1'
_cell_volume   56.29
_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
  Cu  Cu0  1  0.42  0.34  0.14  1.0
  Cu  Cu1  1  0.42  0.34  0.86  1.0
  Ni  Ni2  1  0.0  0.0  0.0  1.0
  Hg  Hg3  1  0.0  0.67  0.0  1.0

Cu Cu Ni Hg