data_Zr2ZnHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.15
_cell_length_b   3.15
_cell_length_c   8.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Zr2ZnHg
_chemical_formula_sum   'Zr2 Zn1 Hg1'
_cell_volume   82.89
_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
  Zr  Zr2  1  0.58  0.58  0.17  1.0
  Zr  Zr3  1  0.0  0.0  0.12  1.0
  Zn  Zn1  1  0.0  0.0  0.23  1.0
  Hg  Hg0  1  0.58  0.58  0.36  1.0

data_Zr2ZnHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.45
_cell_length_b   4.45
_cell_length_c   8.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Zr2ZnHg
_chemical_formula_sum   'Zr4 Zn2 Hg2'
_cell_volume   165.78
_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
  Zr  Zr0  2  0.0  0.0  0.12  1.0
  Zr  Zr1  2  0.08  0.5  0.17  1.0
  Zn  Zn2  2  0.0  0.0  0.23  1.0
  Hg  Hg3  2  0.08  0.5  0.36  1.0

Zr Zr Zn Hg