data_Ca2GaHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.3
_cell_length_b   5.3
_cell_length_c   3.72
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2GaHg
_chemical_formula_sum   'Ca2 Ga1 Hg1'
_cell_volume   104.49
_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
  Ca  Ca0  1  0.65  0.0  0.86  1.0
  Ca  Ca1  1  0.0  0.65  0.86  1.0
  Ga  Ga2  1  0.0  0.0  0.0  1.0
  Hg  Hg3  1  0.65  0.65  0.0  1.0

data_Ca2GaHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.5
_cell_length_b   7.5
_cell_length_c   3.72
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ca2GaHg
_chemical_formula_sum   'Ca4 Ga2 Hg2'
_cell_volume   208.99
_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
  Ca  Ca0  4  0.33  0.33  0.86  1.0
  Ga  Ga1  2  0.0  0.0  0.0  1.0
  Hg  Hg2  2  0.15  0.5  0.0  1.0

Ca Ca Ga Hg
Ca2HgGa crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ca2HgGa clusters. Ca(1) is bonded in a distorted L-shaped geometry to one Hg(1) and one Ga(1) atom. The Ca(1)-Hg(1) bond length is 1.92 Å. The Ca(1)-Ga(1) bond length is 1.92 Å. Hg(1) is bonded in a distorted L-shaped geometry to two equivalent Ca(1) atoms. Ga(1) is bonded in a distorted L-shaped geometry to two equivalent Ca(1) atoms.