data_Si2HgCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.48
_cell_length_b   6.48
_cell_length_c   6.48
_cell_angle_alpha   152.55
_cell_angle_beta   138.72
_cell_angle_gamma   50.29
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2HgCl
_chemical_formula_sum   'Si2 Hg1 Cl1'
_cell_volume   82.32
_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
  Si  Si2  1  0.0  0.0  0.27  1.0
  Si  Si3  1  0.54  0.0  0.36  1.0
  Hg  Hg1  1  0.0  0.28  0.23  1.0
  Cl  Cl0  1  0.0  0.0  0.87  1.0

data_Si2HgCl
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.07
_cell_length_b   4.57
_cell_length_c   6.48
_cell_angle_alpha   110.64
_cell_angle_beta   103.72
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2HgCl
_chemical_formula_sum   'Si2 Hg1 Cl1'
_cell_volume   82.32
_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
  Si  Si0  1  0.0  0.27  0.27  1.0
  Si  Si1  1  0.0  0.36  0.82  1.0
  Hg  Hg2  1  0.72  0.95  0.95  1.0
  Cl  Cl3  1  0.0  0.87  0.87  1.0

Si Si Hg Cl