data_AgHg2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   5.2
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgHg2Pb
_chemical_formula_sum   'Ag1 Hg2 Pb1'
_cell_volume   99.3
_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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.51  0.51  0.51  1.0
  Hg  Hg2  1  0.84  0.84  0.84  1.0
  Pb  Pb3  1  0.68  0.68  0.68  1.0

data_AgHg2Pb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   12.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   AgHg2Pb
_chemical_formula_sum   'Ag3 Hg6 Pb3'
_cell_volume   297.9
_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
  Ag  Ag0  3  0.0  0.0  0.0  1.0
  Hg  Hg1  3  0.0  0.0  0.16  1.0
  Hg  Hg2  3  0.0  0.0  0.49  1.0
  Pb  Pb3  3  0.0  0.0  0.32  1.0

Ag Hg Hg Pb
AgHg2Pb crystallizes in the trigonal R3m space group. Ag(1) is bonded to one Hg(2) and three equivalent Pb(1) atoms to form AgHgPb3 trigonal pyramids that share  a cornercorner with one Pb(1)Ag3Hg2 trigonal bipyramid and corners with six equivalent Ag(1)HgPb3 trigonal pyramids. The Ag(1)-Hg(2) bond length is 2.07 Å. All Ag(1)-Pb(1) bond lengths are 3.00 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a single-bond geometry to one Pb(1) atom. The Hg(1)-Pb(1) bond length is 2.07 Å. In the second Hg site, Hg(2) is bonded in a distorted linear geometry to one Ag(1) and one Pb(1) atom. The Hg(2)-Pb(1) bond length is 2.07 Å. Pb(1) is bonded to three equivalent Ag(1), one Hg(1), and one Hg(2) atom to form distorted PbAg3Hg2 trigonal bipyramids that share corners with six equivalent Pb(1)Ag3Hg2 trigonal bipyramids and  a cornercorner with one Ag(1)HgPb3 trigonal pyramid.