data_HfMgAu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.88
_cell_length_b   4.88
_cell_length_c   3.2
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfMgAu2
_chemical_formula_sum   'Hf1 Mg1 Au2'
_cell_volume   76.32
_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
  Hf  Hf2  1  0.44  0.44  0.0  1.0
  Mg  Mg3  1  0.0  0.0  0.0  1.0
  Au  Au0  1  0.0  0.44  0.6  1.0
  Au  Au1  1  0.44  0.0  0.6  1.0

data_HfMgAu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.9
_cell_length_b   6.9
_cell_length_c   3.2
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HfMgAu2
_chemical_formula_sum   'Hf2 Mg2 Au4'
_cell_volume   152.63
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Hf  Hf0  2  0.44  0.0  -0.0  1.0
  Mg  Mg1  2  0.0  0.0  0.0  1.0
  Au  Au2  4  0.22  0.22  0.6  1.0

Hf Mg Au Au
MgHfAu2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 8-coordinate geometry to eight equivalent Au(1) atoms. There are a spread of Mg(1)-Au(1) bond distances ranging from 2.50-3.34 Å. Hf(1) is bonded in a 8-coordinate geometry to eight equivalent Au(1) atoms. There are a spread of Hf(1)-Au(1) bond distances ranging from 2.50-3.34 Å. Au(1) is bonded in a 8-coordinate geometry to four equivalent Mg(1) and four equivalent Hf(1) atoms.