data_AlCrAgHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.64
_cell_length_b   4.64
_cell_length_c   4.64
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCrAgHg
_chemical_formula_sum   'Al1 Cr1 Ag1 Hg1'
_cell_volume   70.64
_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  Al1  1  0.0  0.0  0.0  1.0
  Cr  Cr2  1  0.92  0.92  0.92  1.0
  Ag  Ag0  1  0.64  0.64  0.64  1.0
  Hg  Hg3  1  0.28  0.28  0.28  1.0

data_AlCrAgHg
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.64
_cell_length_b   4.64
_cell_length_c   11.37
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   AlCrAgHg
_chemical_formula_sum   'Al3 Cr3 Ag3 Hg3'
_cell_volume   211.91
_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
  Al  Al0  3  0.0  0.0  0.0  1.0
  Cr  Cr1  3  0.0  0.0  0.08  1.0
  Ag  Ag2  3  0.0  0.0  0.36  1.0
  Hg  Hg3  3  0.0  0.0  0.72  1.0

Al Cr Ag Hg
Al Cr Ag Hg 0 1 - - - 0 2 o - - 0 2 - o - 0 2 - - o 0 3 o o - 0 3 o - o 0 3 - o o 1 2 + o o 1 2 o + o 1 2 o o + 1 3 + + o 1 3 + o + 1 3 o + + 2 3 o o + 2 3 o + o 2 3 + o o 
CrAgHgAl crystallizes in the trigonal R3m space group. Cr(1) is bonded in a single-bond geometry to four equivalent Ag(1), three equivalent Hg(1), and one Al(1) atom. There are three shorter (2.74 Å) and one longer (3.19 Å) Cr(1)-Ag(1) bond length. All Cr(1)-Hg(1) bond lengths are 2.70 Å. The Cr(1)-Al(1) bond length is 0.89 Å. Ag(1) is bonded in a distorted q6 geometry to four equivalent Cr(1), three equivalent Hg(1), and three equivalent Al(1) atoms. All Ag(1)-Hg(1) bond lengths are 2.70 Å. All Ag(1)-Al(1) bond lengths are 2.70 Å. Hg(1) is bonded in a distorted q6 geometry to three equivalent Cr(1), three equivalent Ag(1), and four equivalent Al(1) atoms. There are three shorter (2.74 Å) and one longer (3.19 Å) Hg(1)-Al(1) bond length. Al(1) is bonded in a single-bond geometry to one Cr(1), three equivalent Ag(1), and four equivalent Hg(1) atoms.