data_MgAgHgTe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgAgHgTe
_chemical_formula_sum   'Mg1 Ag1 Hg1 Te1'
_cell_volume   97.59
_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
  Mg  Mg2  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.83  0.83  0.83  1.0
  Hg  Hg1  1  0.65  0.65  0.65  1.0
  Te  Te3  1  0.48  0.48  0.48  1.0

data_MgAgHgTe
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   12.66
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   MgAgHgTe
_chemical_formula_sum   'Mg3 Ag3 Hg3 Te3'
_cell_volume   292.77
_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
  Mg  Mg0  3  0.0  0.0  0.0  1.0
  Ag  Ag1  3  0.0  0.0  0.17  1.0
  Hg  Hg2  3  0.0  0.0  0.35  1.0
  Te  Te3  3  0.0  0.0  0.52  1.0

Mg Ag Hg Te
MgAgHgTe crystallizes in the trigonal R3m space group. Mg(1) is bonded to one Ag(1) and three equivalent Hg(1) atoms to form distorted MgAgHg3 trigonal pyramids that share  a cornercorner with one Hg(1)Mg3AgTe trigonal bipyramid and corners with six equivalent Mg(1)AgHg3 trigonal pyramids. The Mg(1)-Ag(1) bond length is 2.19 Å. All Mg(1)-Hg(1) bond lengths are 2.99 Å. Ag(1) is bonded in a 5-coordinate geometry to one Mg(1), one Hg(1), and three equivalent Te(1) atoms. The Ag(1)-Hg(1) bond length is 2.19 Å. All Ag(1)-Te(1) bond lengths are 2.99 Å. Hg(1) is bonded to three equivalent Mg(1), one Ag(1), and one Te(1) atom to form HgMg3AgTe trigonal bipyramids that share corners with six equivalent Hg(1)Mg3AgTe trigonal bipyramids and  a cornercorner with one Mg(1)AgHg3 trigonal pyramid. The Hg(1)-Te(1) bond length is 2.19 Å. Te(1) is bonded in a 4-coordinate geometry to three equivalent Ag(1) and one Hg(1) atom.