Mg2Cd crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded to seven equivalent Mg(1) and five equivalent Cd(1) atoms to form distorted MgMg7Cd5 cuboctahedra that share corners with nine equivalent Mg(1)Mg7Cd5 cuboctahedra, corners with nine equivalent Cd(1)Mg10Cd2 cuboctahedra, edges with four equivalent Cd(1)Mg10Cd2 cuboctahedra, edges with fourteen equivalent Mg(1)Mg7Cd5 cuboctahedra, faces with seven equivalent Cd(1)Mg10Cd2 cuboctahedra, and faces with thirteen equivalent Mg(1)Mg7Cd5 cuboctahedra. Cd(1) is bonded to ten equivalent Mg(1) and two equivalent Cd(1) atoms to form distorted CdMg10Cd2 cuboctahedra that share corners with eighteen equivalent Mg(1)Mg7Cd5 cuboctahedra, edges with eight equivalent Mg(1)Mg7Cd5 cuboctahedra, edges with ten equivalent Cd(1)Mg10Cd2 cuboctahedra, faces with six equivalent Cd(1)Mg10Cd2 cuboctahedra, and faces with fourteen equivalent Mg(1)Mg7Cd5 cuboctahedra.
Mg2Cd crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded to seven equivalent Mg(1) and five equivalent Cd(1) atoms to form distorted MgMg7Cd5 cuboctahedra that share corners with nine equivalent Mg(1)Mg7Cd5 cuboctahedra, corners with nine equivalent Cd(1)Mg10Cd2 cuboctahedra, edges with four equivalent Cd(1)Mg10Cd2 cuboctahedra, edges with fourteen equivalent Mg(1)Mg7Cd5 cuboctahedra, faces with seven equivalent Cd(1)Mg10Cd2 cuboctahedra, and faces with thirteen equivalent Mg(1)Mg7Cd5 cuboctahedra. There are a spread of Mg(1)-Mg(1) bond distances ranging from 3.04-3.17 Å. There are a spread of Mg(1)-Cd(1) bond distances ranging from 3.07-3.13 Å. Cd(1) is bonded to ten equivalent Mg(1) and two equivalent Cd(1) atoms to form distorted CdMg10Cd2 cuboctahedra that share corners with eighteen equivalent Mg(1)Mg7Cd5 cuboctahedra, edges with eight equivalent Mg(1)Mg7Cd5 cuboctahedra, edges with ten equivalent Cd(1)Mg10Cd2 cuboctahedra, faces with six equivalent Cd(1)Mg10Cd2 cuboctahedra, and faces with fourteen equivalent Mg(1)Mg7Cd5 cuboctahedra. Both Cd(1)-Cd(1) bond lengths are 3.17 Å.