data_SnHg2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.18
_cell_length_b   5.18
_cell_length_c   5.18
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnHg2Ge
_chemical_formula_sum   'Sn1 Hg2 Ge1'
_cell_volume   98.25
_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
  Sn  Sn3  1  0.49  0.49  0.49  1.0
  Hg  Hg1  1  0.66  0.66  0.66  1.0
  Hg  Hg2  1  0.83  0.83  0.83  1.0
  Ge  Ge0  1  0.0  0.0  0.0  1.0

data_SnHg2Ge
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.18
_cell_length_b   5.18
_cell_length_c   12.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SnHg2Ge
_chemical_formula_sum   'Sn3 Hg6 Ge3'
_cell_volume   294.76
_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
  Sn  Sn0  3  0.0  0.0  0.51  1.0
  Hg  Hg1  3  0.0  0.0  0.17  1.0
  Hg  Hg2  3  0.0  0.0  0.34  1.0
  Ge  Ge3  3  0.0  0.0  0.0  1.0

Sn Hg Hg Ge
Hg2SnGe crystallizes in the trigonal R3m space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to one Hg(2), one Sn(1), and three equivalent Ge(1) atoms to form distorted HgSnHgGe3 trigonal bipyramids that share corners with six equivalent Hg(1)SnHgGe3 trigonal bipyramids,  a cornercorner with one Ge(1)Hg4 trigonal pyramid, corners with three equivalent Sn(1)Hg4 trigonal pyramids, and edges with three equivalent Hg(2)Sn3HgGe trigonal bipyramids. The Hg(1)-Hg(2) bond length is 2.14 Å. The Hg(1)-Sn(1) bond length is 2.14 Å. All Hg(1)-Ge(1) bond lengths are 2.99 Å. In the second Hg site, Hg(2) is bonded to one Hg(1), three equivalent Sn(1), and one Ge(1) atom to form HgSn3HgGe trigonal bipyramids that share corners with six equivalent Hg(2)Sn3HgGe trigonal bipyramids,  a cornercorner with one Sn(1)Hg4 trigonal pyramid, corners with three equivalent Ge(1)Hg4 trigonal pyramids, and edges with three equivalent Hg(1)SnHgGe3 trigonal bipyramids. All Hg(2)-Sn(1) bond lengths are 2.99 Å. The Hg(2)-Ge(1) bond length is 2.14 Å. Sn(1) is bonded to one Hg(1) and three equivalent Hg(2) atoms to form SnHg4 trigonal pyramids that share  a cornercorner with one Hg(2)Sn3HgGe trigonal bipyramid, corners with three equivalent Hg(1)SnHgGe3 trigonal bipyramids, corners with six equivalent Sn(1)Hg4 trigonal pyramids, and edges with three equivalent Ge(1)Hg4 trigonal pyramids. Ge(1) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form GeHg4 trigonal pyramids that share  a cornercorner with one Hg(1)SnHgGe3 trigonal bipyramid, corners with three equivalent Hg(2)Sn3HgGe trigonal bipyramids, corners with six equivalent Ge(1)Hg4 trigonal pyramids, and edges with three equivalent Sn(1)Hg4 trigonal pyramids.