Mg14CeAl crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms to form MgMg10Al2 cuboctahedra that share corners with four equivalent Ce(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Mg10Al2 cuboctahedra, corners with eight equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with two equivalent Al(1)Mg12 cuboctahedra, edges with four equivalent Mg(1)Mg10Al2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Al(1)Mg12 cuboctahedra, faces with four equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with ten equivalent Mg(3)CeMg10Al cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(1) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Al(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Mg10Al2 cuboctahedra, edges with two equivalent Ce(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Mg(1)Mg10Al2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, faces with four equivalent Mg(2)Ce2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)CeMg10Al cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), one Ce(1), and one Al(1) atom to form distorted MgCeMg10Al cuboctahedra that share corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with fourteen equivalent Mg(3)CeMg10Al cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Ce(1)Mg12 cuboctahedra, edges with two equivalent Al(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(3)CeMg10Al cuboctahedra, edges with four equivalent Mg(1)Mg10Al2 cuboctahedra,  a faceface with one Ce(1)Mg12 cuboctahedra,  a faceface with one Al(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with five equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with five equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with six equivalent Mg(3)CeMg10Al cuboctahedra. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, corners with twelve equivalent Mg(3)CeMg10Al cuboctahedra, edges with six equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with six equivalent Mg(3)CeMg10Al cuboctahedra, edges with six equivalent Mg(1)Mg10Al2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with three equivalent Mg(1)Mg10Al2 cuboctahedra, faces with three equivalent Ce(1)Mg12 cuboctahedra, faces with three equivalent Al(1)Mg12 cuboctahedra, and faces with six equivalent Mg(3)CeMg10Al cuboctahedra. Ce(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CeMg12 cuboctahedra that share corners with six equivalent Ce(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Mg10Al2 cuboctahedra, edges with six equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Al(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with six equivalent Mg(3)CeMg10Al cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. Al(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form AlMg12 cuboctahedra that share corners with six equivalent Al(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with six equivalent Mg(1)Mg10Al2 cuboctahedra, edges with twelve equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, faces with six equivalent Mg(3)CeMg10Al cuboctahedra, faces with six equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.
Mg14CeAl crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms to form MgMg10Al2 cuboctahedra that share corners with four equivalent Ce(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Mg10Al2 cuboctahedra, corners with eight equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with two equivalent Al(1)Mg12 cuboctahedra, edges with four equivalent Mg(1)Mg10Al2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Al(1)Mg12 cuboctahedra, faces with four equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with ten equivalent Mg(3)CeMg10Al cuboctahedra. Both Mg(1)-Mg(4) bond lengths are 3.26 Å. There are two shorter (3.17 Å) and two longer (3.27 Å) Mg(1)-Mg(1) bond lengths. All Mg(1)-Mg(3) bond lengths are 3.11 Å. Both Mg(1)-Al(1) bond lengths are 3.22 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(1) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Al(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Mg10Al2 cuboctahedra, edges with two equivalent Ce(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Mg(1)Mg10Al2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, faces with four equivalent Mg(2)Ce2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)CeMg10Al cuboctahedra. Both Mg(2)-Mg(4) bond lengths are 3.13 Å. There are two shorter (3.08 Å) and two longer (3.35 Å) Mg(2)-Mg(2) bond lengths. All Mg(2)-Mg(3) bond lengths are 3.24 Å. Both Mg(2)-Ce(1) bond lengths are 3.22 Å. In the third Mg site, Mg(3) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), one Ce(1), and one Al(1) atom to form distorted MgCeMg10Al cuboctahedra that share corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with fourteen equivalent Mg(3)CeMg10Al cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Ce(1)Mg12 cuboctahedra, edges with two equivalent Al(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(3)CeMg10Al cuboctahedra, edges with four equivalent Mg(1)Mg10Al2 cuboctahedra,  a faceface with one Ce(1)Mg12 cuboctahedra,  a faceface with one Al(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with five equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with five equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with six equivalent Mg(3)CeMg10Al cuboctahedra. Both Mg(3)-Mg(4) bond lengths are 3.22 Å. There are two shorter (3.21 Å) and two longer (3.23 Å) Mg(3)-Mg(3) bond lengths. The Mg(3)-Ce(1) bond length is 3.26 Å. The Mg(3)-Al(1) bond length is 3.10 Å. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, corners with twelve equivalent Mg(3)CeMg10Al cuboctahedra, edges with six equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with six equivalent Mg(3)CeMg10Al cuboctahedra, edges with six equivalent Mg(1)Mg10Al2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with three equivalent Mg(1)Mg10Al2 cuboctahedra, faces with three equivalent Ce(1)Mg12 cuboctahedra, faces with three equivalent Al(1)Mg12 cuboctahedra, and faces with six equivalent Mg(3)CeMg10Al cuboctahedra. Ce(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CeMg12 cuboctahedra that share corners with six equivalent Ce(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Mg10Al2 cuboctahedra, edges with six equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Al(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with six equivalent Mg(3)CeMg10Al cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. Al(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form AlMg12 cuboctahedra that share corners with six equivalent Al(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with six equivalent Mg(1)Mg10Al2 cuboctahedra, edges with twelve equivalent Mg(3)CeMg10Al cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, faces with six equivalent Mg(3)CeMg10Al cuboctahedra, faces with six equivalent Mg(1)Mg10Al2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.