data_CrHg2Cl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.12
_cell_length_b   5.12
_cell_length_c   5.12
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrHg2Cl
_chemical_formula_sum   'Cr1 Hg2 Cl1'
_cell_volume   95.01
_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
  Cr  Cr1  1  0.81  0.81  0.81  1.0
  Hg  Hg2  1  0.62  0.62  0.62  1.0
  Hg  Hg3  1  0.43  0.43  0.43  1.0
  Cl  Cl0  1  0.0  0.0  0.0  1.0

data_CrHg2Cl
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.12
_cell_length_b   5.12
_cell_length_c   12.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   CrHg2Cl
_chemical_formula_sum   'Cr3 Hg6 Cl3'
_cell_volume   285.02
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Cr  Cr0  3  0.0  0.0  0.19  1.0
  Hg  Hg1  3  0.0  0.0  0.38  1.0
  Hg  Hg2  3  0.0  0.0  0.57  1.0
  Cl  Cl3  3  0.0  0.0  0.0  1.0

Cr Hg Hg Cl
Cr Hg Hg Cl 0 1 o o o 0 3 + + + 0 2 + o o 0 2 o + o 0 2 o o + 1 2 o o o 1 3 + + o 1 3 + o + 1 3 o + + 2 3 o o + 2 3 o + o 2 3 + o o 
CrHg2Cl crystallizes in the trigonal R3m space group. Cr(1) is bonded in a 2-coordinate geometry to one Hg(1), three equivalent Hg(2), and one Cl(1) atom. The Cr(1)-Hg(1) bond length is 2.37 Å. All Cr(1)-Hg(2) bond lengths are 3.01 Å. The Cr(1)-Cl(1) bond length is 2.37 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 5-coordinate geometry to one Cr(1), one Hg(2), and three equivalent Cl(1) atoms. The Hg(1)-Hg(2) bond length is 2.37 Å. All Hg(1)-Cl(1) bond lengths are 3.01 Å. In the second Hg site, Hg(2) is bonded to three equivalent Cr(1) and one Hg(1) atom to form distorted corner-sharing HgCr3Hg trigonal pyramids. Cl(1) is bonded in a distorted single-bond geometry to one Cr(1) and three equivalent Hg(1) atoms.