The crystal structure described by MgCd5 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to two equivalent Mg(1), one Cd(4), two equivalent Cd(1), two equivalent Cd(3), two equivalent Cd(5), and three equivalent Cd(2) atoms to form distorted MgMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with three equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(4)MgCd11 cuboctahedra, edges with six equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with two equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with four equivalent Cd(4)MgCd11 cuboctahedra, and faces with five equivalent Cd(2)Mg3Cd9 cuboctahedra. There are five inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to two equivalent Mg(1), one Cd(3), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(4), and three equivalent Cd(5) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with three equivalent Cd(4)MgCd11 cuboctahedra, edges with four equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with six equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(3)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(5)Mg2Cd10 cuboctahedra. In the second Cd site, Cd(2) is bonded to three equivalent Mg(1), one Cd(5), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(3), and two equivalent Cd(4) atoms to form distorted CdMg3Cd9 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(4)MgCd11 cuboctahedra, edges with four equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(5)Mg2Cd10 cuboctahedra, and faces with five equivalent Mg(1)Mg2Cd10 cuboctahedra. In the third Cd site, Cd(3) is bonded to two equivalent Mg(1), one Cd(1), two equivalent Cd(2), two equivalent Cd(3), two equivalent Cd(5), and three equivalent Cd(4) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(4)MgCd11 cuboctahedra, edges with three equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with two equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with four equivalent Cd(1)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(4)MgCd11 cuboctahedra. In the fourth Cd site, Cd(4) is bonded to one Mg(1), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(4), two equivalent Cd(5), and three equivalent Cd(3) atoms to form distorted CdMgCd11 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with four equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(4)MgCd11 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with four equivalent Mg(1)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(3)Mg2Cd10 cuboctahedra. In the fifth Cd site, Cd(5) is bonded to two equivalent Mg(1), one Cd(2), two equivalent Cd(3), two equivalent Cd(4), two equivalent Cd(5), and three equivalent Cd(1) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with six equivalent Cd(4)MgCd11 cuboctahedra, faces with two equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(2)Mg3Cd9 cuboctahedra, and faces with five equivalent Cd(1)Mg2Cd10 cuboctahedra. is represented by the CIF file [CIF]
data_MgCd5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.203
_cell_length_b   6.203
_cell_length_c   7.559
_cell_angle_alpha   69.957
_cell_angle_beta   69.957
_cell_angle_gamma   28.365
_symmetry_Int_Tables_number   1
_cell_volume   129.274
_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
  Mg  Mg0  1  0.612  0.612  0.278  1.0
  Cd  Cd1  1  0.006  0.006  0.003  1.0
  Cd  Cd2  1  0.333  0.333  0.331  1.0
  Cd  Cd3  1  0.941  0.941  0.613  1.0
  Cd  Cd4  1  0.663  0.663  0.662  1.0
  Cd  Cd5  1  0.278  0.278  0.947  1.0
[/CIF]
.
The crystal structure described by MgCd5 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to two equivalent Mg(1), one Cd(4), two equivalent Cd(1), two equivalent Cd(3), two equivalent Cd(5), and three equivalent Cd(2) atoms to form distorted MgMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with three equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(4)MgCd11 cuboctahedra, edges with six equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with two equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with four equivalent Cd(4)MgCd11 cuboctahedra, and faces with five equivalent Cd(2)Mg3Cd9 cuboctahedra. There are five inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to two equivalent Mg(1), one Cd(3), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(4), and three equivalent Cd(5) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with three equivalent Cd(4)MgCd11 cuboctahedra, edges with four equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with six equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(3)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(5)Mg2Cd10 cuboctahedra. In the second Cd site, Cd(2) is bonded to three equivalent Mg(1), one Cd(5), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(3), and two equivalent Cd(4) atoms to form distorted CdMg3Cd9 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(4)MgCd11 cuboctahedra, edges with four equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(5)Mg2Cd10 cuboctahedra, and faces with five equivalent Mg(1)Mg2Cd10 cuboctahedra. In the third Cd site, Cd(3) is bonded to two equivalent Mg(1), one Cd(1), two equivalent Cd(2), two equivalent Cd(3), two equivalent Cd(5), and three equivalent Cd(4) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(4)MgCd11 cuboctahedra, edges with three equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with two equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with four equivalent Cd(1)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(4)MgCd11 cuboctahedra. In the fourth Cd site, Cd(4) is bonded to one Mg(1), two equivalent Cd(1), two equivalent Cd(2), two equivalent Cd(4), two equivalent Cd(5), and three equivalent Cd(3) atoms to form distorted CdMgCd11 cuboctahedra that share corners with six equivalent Cd(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(2)Mg3Cd9 cuboctahedra, corners with six equivalent Cd(4)MgCd11 cuboctahedra, edges with two equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with four equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with six equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with two equivalent Cd(4)MgCd11 cuboctahedra, faces with three equivalent Cd(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(2)Mg3Cd9 cuboctahedra, faces with four equivalent Mg(1)Mg2Cd10 cuboctahedra, and faces with five equivalent Cd(3)Mg2Cd10 cuboctahedra. In the fifth Cd site, Cd(5) is bonded to two equivalent Mg(1), one Cd(2), two equivalent Cd(3), two equivalent Cd(4), two equivalent Cd(5), and three equivalent Cd(1) atoms to form distorted CdMg2Cd10 cuboctahedra that share corners with six equivalent Mg(1)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(3)Mg2Cd10 cuboctahedra, corners with six equivalent Cd(5)Mg2Cd10 cuboctahedra, edges with two equivalent Cd(1)Mg2Cd10 cuboctahedra, edges with three equivalent Mg(1)Mg2Cd10 cuboctahedra, edges with three equivalent Cd(3)Mg2Cd10 cuboctahedra, edges with four equivalent Cd(2)Mg3Cd9 cuboctahedra, edges with six equivalent Cd(4)MgCd11 cuboctahedra, faces with two equivalent Cd(5)Mg2Cd10 cuboctahedra, faces with three equivalent Mg(1)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(3)Mg2Cd10 cuboctahedra, faces with three equivalent Cd(4)MgCd11 cuboctahedra, faces with four equivalent Cd(2)Mg3Cd9 cuboctahedra, and faces with five equivalent Cd(1)Mg2Cd10 cuboctahedra. is represented by the CIF file [CIF]
data_MgCd5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.203
_cell_length_b   6.203
_cell_length_c   7.559
_cell_angle_alpha   69.957
_cell_angle_beta   69.957
_cell_angle_gamma   28.365
_symmetry_Int_Tables_number   1
_cell_volume   129.274
_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
  Mg  Mg0  1  0.612  0.612  0.278  1.0
  Cd  Cd1  1  0.006  0.006  0.003  1.0
  Cd  Cd2  1  0.333  0.333  0.331  1.0
  Cd  Cd3  1  0.941  0.941  0.613  1.0
  Cd  Cd4  1  0.663  0.663  0.662  1.0
  Cd  Cd5  1  0.278  0.278  0.947  1.0
[/CIF]
.