NaMg6Ce crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms to form NaCe2Mg10 cuboctahedra that share corners with four equivalent Ce(1)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Ce2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Ce(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms to form distorted MgNa2Ce2Mg8 cuboctahedra that share corners with four equivalent Na(1)Ce2Mg10 cuboctahedra, corners with four equivalent Ce(1)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Na(1)Ce2Mg10 cuboctahedra, edges with two equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Ce(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. Ce(1) is bonded to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form CeNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Ce2Mg10 cuboctahedra, corners with six equivalent Ce(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Na(1)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra.
NaMg6Ce crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms to form NaCe2Mg10 cuboctahedra that share corners with four equivalent Ce(1)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Ce2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Ce(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra. Both Na(1)-Mg(4) bond lengths are 3.24 Å. There are two shorter (3.26 Å) and two longer (3.45 Å) Na(1)-Mg(1) bond lengths. All Na(1)-Mg(2) bond lengths are 3.27 Å. Both Na(1)-Ce(1) bond lengths are 3.33 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms to form distorted MgNa2Ce2Mg8 cuboctahedra that share corners with four equivalent Na(1)Ce2Mg10 cuboctahedra, corners with four equivalent Ce(1)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Na(1)Ce2Mg10 cuboctahedra, edges with two equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Ce(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra. There is one shorter (3.25 Å) and one longer (3.41 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(2) bond lengths are 3.15 Å. Both Mg(1)-Mg(3) bond lengths are 3.21 Å. Both Mg(1)-Mg(4) bond lengths are 3.28 Å. Both Mg(1)-Ce(1) bond lengths are 3.36 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. There is one shorter (3.30 Å) and one longer (3.35 Å) Mg(2)-Mg(2) bond length. There is one shorter (3.21 Å) and one longer (3.50 Å) Mg(2)-Mg(3) bond length. There is one shorter (3.28 Å) and one longer (3.44 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-Ce(1) bond lengths are 3.28 Å. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.33 Å. Both Mg(3)-Ce(1) bond lengths are 3.26 Å. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. Ce(1) is bonded to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form CeNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Ce2Mg10 cuboctahedra, corners with six equivalent Ce(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, edges with two equivalent Na(1)Ce2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra, faces with two equivalent Na(1)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(1)Na2Ce2Mg8 cuboctahedra.