data_MgAgSnHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   5.04
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgAgSnHg
_chemical_formula_sum   'Mg1 Ag1 Sn1 Hg1'
_cell_volume   90.54
_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  0.35  0.35  0.35  1.0
  Sn  Sn3  1  0.78  0.78  0.78  1.0
  Hg  Hg1  1  0.56  0.56  0.56  1.0

data_MgAgSnHg
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   12.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   MgAgSnHg
_chemical_formula_sum   'Mg3 Ag3 Sn3 Hg3'
_cell_volume   271.62
_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  0.65  1.0
  Sn  Sn2  3  0.0  0.0  0.22  1.0
  Hg  Hg3  3  0.0  0.0  0.44  1.0

Mg Ag Sn Hg
MgAgHgSn crystallizes in the trigonal R3m space group. Mg(1) is bonded in a 10-coordinate geometry to three equivalent Ag(1), three equivalent Hg(1), and four equivalent Sn(1) atoms. All Mg(1)-Ag(1) bond lengths are 2.91 Å. All Mg(1)-Hg(1) bond lengths are 3.17 Å. There is one shorter (2.69 Å) and three longer (3.24 Å) Mg(1)-Sn(1) bond lengths. Ag(1) is bonded to three equivalent Mg(1) and four equivalent Hg(1) atoms to form a mixture of distorted edge and corner-sharing AgMg3Hg4 trigonal pyramids. There is one shorter (2.69 Å) and three longer (3.24 Å) Ag(1)-Hg(1) bond lengths. Hg(1) is bonded in a 11-coordinate geometry to three equivalent Mg(1), four equivalent Ag(1), and four equivalent Sn(1) atoms. There is one shorter (2.69 Å) and three longer (3.24 Å) Hg(1)-Sn(1) bond lengths. Sn(1) is bonded in a 1-coordinate geometry to four equivalent Mg(1) and four equivalent Hg(1) atoms.