The compound described by Mg2Cd crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Cd(1) atoms to form distorted MgMg6Cd6 cuboctahedra that share corners with six equivalent Mg(1)Mg6Cd6 cuboctahedra, corners with six equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with twelve equivalent Cd(1)Mg10 cuboctahedra,  an edgeedge with one Cd(1)Mg10 cuboctahedra, edges with eleven equivalent Mg(2)Mg8Cd4 cuboctahedra, faces with four equivalent Mg(2)Mg8Cd4 cuboctahedra, faces with six equivalent Cd(1)Mg10 cuboctahedra, and faces with ten equivalent Mg(1)Mg6Cd6 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Cd(1) atoms to form distorted MgMg8Cd4 cuboctahedra that share corners with six equivalent Mg(1)Mg6Cd6 cuboctahedra, corners with six equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with eight equivalent Cd(1)Mg10 cuboctahedra,  an edgeedge with one Cd(1)Mg10 cuboctahedra, edges with four equivalent Mg(2)Mg8Cd4 cuboctahedra, edges with eleven equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with four equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with eight equivalent Mg(2)Mg8Cd4 cuboctahedra, and faces with eight equivalent Cd(1)Mg10 cuboctahedra. Cd(1) is bonded to four equivalent Mg(2) and six equivalent Mg(1) atoms to form distorted CdMg10 cuboctahedra that share corners with four equivalent Cd(1)Mg10 cuboctahedra, corners with eight equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with twelve equivalent Mg(1)Mg6Cd6 cuboctahedra,  an edgeedge with one Mg(1)Mg6Cd6 cuboctahedra,  an edgeedge with one Mg(2)Mg8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Mg10 cuboctahedra, faces with six equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with six equivalent Cd(1)Mg10 cuboctahedra, and faces with eight equivalent Mg(2)Mg8Cd4 cuboctahedra. is represented by the CIF file [CIF]
data_Mg2Cd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.205
_cell_length_b   5.027
_cell_length_c   8.081
_cell_angle_alpha   90.000
_cell_angle_beta   101.437
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   127.626
_cell_formula_units_Z   2
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
  Cd  Cd0  1  0.112  0.750  0.224  1.0
  Cd  Cd1  1  0.888  0.250  0.776  1.0
  Mg  Mg2  1  0.443  0.750  0.886  1.0
  Mg  Mg3  1  0.775  0.750  0.549  1.0
  Mg  Mg4  1  0.225  0.250  0.451  1.0
  Mg  Mg5  1  0.557  0.250  0.114  1.0
[/CIF]
.
The compound described by Mg2Cd crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Cd(1) atoms to form distorted MgMg6Cd6 cuboctahedra that share corners with six equivalent Mg(1)Mg6Cd6 cuboctahedra, corners with six equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with twelve equivalent Cd(1)Mg10 cuboctahedra,  an edgeedge with one Cd(1)Mg10 cuboctahedra, edges with eleven equivalent Mg(2)Mg8Cd4 cuboctahedra, faces with four equivalent Mg(2)Mg8Cd4 cuboctahedra, faces with six equivalent Cd(1)Mg10 cuboctahedra, and faces with ten equivalent Mg(1)Mg6Cd6 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Cd(1) atoms to form distorted MgMg8Cd4 cuboctahedra that share corners with six equivalent Mg(1)Mg6Cd6 cuboctahedra, corners with six equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with eight equivalent Cd(1)Mg10 cuboctahedra,  an edgeedge with one Cd(1)Mg10 cuboctahedra, edges with four equivalent Mg(2)Mg8Cd4 cuboctahedra, edges with eleven equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with four equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with eight equivalent Mg(2)Mg8Cd4 cuboctahedra, and faces with eight equivalent Cd(1)Mg10 cuboctahedra. Cd(1) is bonded to four equivalent Mg(2) and six equivalent Mg(1) atoms to form distorted CdMg10 cuboctahedra that share corners with four equivalent Cd(1)Mg10 cuboctahedra, corners with eight equivalent Mg(2)Mg8Cd4 cuboctahedra, corners with twelve equivalent Mg(1)Mg6Cd6 cuboctahedra,  an edgeedge with one Mg(1)Mg6Cd6 cuboctahedra,  an edgeedge with one Mg(2)Mg8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Mg10 cuboctahedra, faces with six equivalent Mg(1)Mg6Cd6 cuboctahedra, faces with six equivalent Cd(1)Mg10 cuboctahedra, and faces with eight equivalent Mg(2)Mg8Cd4 cuboctahedra. is represented by the CIF file [CIF]
data_Mg2Cd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.205
_cell_length_b   5.027
_cell_length_c   8.081
_cell_angle_alpha   90.000
_cell_angle_beta   101.437
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   127.626
_cell_formula_units_Z   2
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
  Cd  Cd0  1  0.112  0.750  0.224  1.0
  Cd  Cd1  1  0.888  0.250  0.776  1.0
  Mg  Mg2  1  0.443  0.750  0.886  1.0
  Mg  Mg3  1  0.775  0.750  0.549  1.0
  Mg  Mg4  1  0.225  0.250  0.451  1.0
  Mg  Mg5  1  0.557  0.250  0.114  1.0
[/CIF]
.