data_Hg2AsIr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.91
_cell_length_b   4.91
_cell_length_c   3.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Hg2AsIr
_chemical_formula_sum   'Hg2 As1 Ir1'
_cell_volume   76.77
_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
  Hg  Hg1  1  0.0  0.46  0.59  1.0
  Hg  Hg2  1  0.46  0.0  0.59  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  Ir  Ir3  1  0.46  0.46  0.0  1.0

data_Hg2AsIr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.95
_cell_length_b   6.95
_cell_length_c   3.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Hg2AsIr
_chemical_formula_sum   'Hg4 As2 Ir2'
_cell_volume   153.54
_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
  Hg  Hg0  4  0.23  0.23  0.59  1.0
  As  As1  2  0.0  0.0  0.0  1.0
  Ir  Ir2  2  0.46  0.0  0.0  1.0

Hg Hg As Ir
IrHg2As crystallizes in the monoclinic Cm space group. Ir(1) is bonded in a 8-coordinate geometry to eight equivalent Hg(1) atoms. There are a spread of Ir(1)-Hg(1) bond distances ranging from 2.59-3.26 Å. Hg(1) is bonded in a 7-coordinate geometry to four equivalent Ir(1) and three equivalent As(1) atoms. There are a spread of Hg(1)-As(1) bond distances ranging from 2.59-2.97 Å. As(1) is bonded in a 6-coordinate geometry to six equivalent Hg(1) atoms.