data_SrMgHgAu
_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   SrMgHgAu
_chemical_formula_sum   'Sr1 Mg1 Hg1 Au1'
_cell_volume   99.51
_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
  Sr  Sr3  1  0.52  0.52  0.52  1.0
  Mg  Mg2  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.84  0.84  0.84  1.0
  Au  Au0  1  0.68  0.68  0.68  1.0

data_SrMgHgAu
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   12.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrMgHgAu
_chemical_formula_sum   'Sr3 Mg3 Hg3 Au3'
_cell_volume   298.54
_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
  Sr  Sr0  3  0.0  0.0  0.48  1.0
  Mg  Mg1  3  0.0  0.0  0.0  1.0
  Hg  Hg2  3  0.0  0.0  0.16  1.0
  Au  Au3  3  0.0  0.0  0.32  1.0

Sr Mg Hg Au
SrMgAuHg crystallizes in the trigonal R3m space group. Sr(1) is bonded in a distorted single-bond geometry to one Au(1) and three equivalent Hg(1) atoms. The Sr(1)-Au(1) bond length is 2.05 Å. All Sr(1)-Hg(1) bond lengths are 3.01 Å. Mg(1) is bonded to three equivalent Au(1) and one Hg(1) atom to form distorted MgHgAu3 trigonal pyramids that share corners with three equivalent Hg(1)Sr3MgAu trigonal bipyramids and corners with six equivalent Mg(1)HgAu3 trigonal pyramids. All Mg(1)-Au(1) bond lengths are 3.01 Å. The Mg(1)-Hg(1) bond length is 2.05 Å. Au(1) is bonded in a 5-coordinate geometry to one Sr(1), three equivalent Mg(1), and one Hg(1) atom. The Au(1)-Hg(1) bond length is 2.05 Å. Hg(1) is bonded to three equivalent Sr(1), one Mg(1), and one Au(1) atom to form distorted HgSr3MgAu trigonal bipyramids that share corners with six equivalent Hg(1)Sr3MgAu trigonal bipyramids and corners with three equivalent Mg(1)HgAu3 trigonal pyramids.