NaMg14Cr crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Cr(1) atoms to form NaMg10Cr2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Na(1)Mg10Cr2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(7)Mg11Cr cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cr(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, corners with eight equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(7)Mg11Cr cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Na(1)Mg10Cr2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, corners with eight equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(6)NaMg11 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Na(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Cr(1) atoms to form distorted MgNa2Mg8Cr2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with six equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, and faces with eight equivalent Mg(5)NaMg10Cr cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Na(1)Mg10Cr2 cuboctahedra, corners with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, corners with four equivalent Cr(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, and faces with eight equivalent Mg(5)NaMg10Cr cuboctahedra. In the fifth Mg site, Mg(5) is bonded to one Na(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Cr(1) atom to form distorted MgNaMg10Cr cuboctahedra that share corners with four equivalent Mg(7)Mg11Cr cuboctahedra, corners with four equivalent Mg(6)NaMg11 cuboctahedra, corners with ten equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(7)Mg11Cr cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Mg(6)NaMg11 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra,  a faceface with one Na(1)Mg10Cr2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra,  a faceface with one Cr(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. In the sixth Mg site, Mg(6) is bonded to one Na(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms to form distorted MgNaMg11 cuboctahedra that share corners with four equivalent Mg(7)Mg11Cr cuboctahedra, corners with six equivalent Mg(6)NaMg11 cuboctahedra, corners with eight equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(7)Mg11Cr cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra,  a faceface with one Na(1)Mg10Cr2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with three equivalent Mg(2)Mg12 cuboctahedra, faces with three equivalent Cr(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. In the seventh Mg site, Mg(7) is bonded to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(6), four equivalent Mg(5), and one Cr(1) atom to form distorted MgMg11Cr cuboctahedra that share corners with four equivalent Mg(6)NaMg11 cuboctahedra, corners with six equivalent Mg(7)Mg11Cr cuboctahedra, corners with eight equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(6)NaMg11 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra,  a faceface with one Cr(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with three equivalent Na(1)Mg10Cr2 cuboctahedra, faces with three equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. Cr(1) is bonded to two equivalent Na(1), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form CrNa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Cr(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(6)NaMg11 cuboctahedra.
NaMg14Cr crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Cr(1) atoms to form NaMg10Cr2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Na(1)Mg10Cr2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(7)Mg11Cr cuboctahedra. Both Na(1)-Mg(6) bond lengths are 3.20 Å. There are two shorter (3.18 Å) and two longer (3.19 Å) Na(1)-Mg(3) bond lengths. All Na(1)-Mg(5) bond lengths are 3.17 Å. Both Na(1)-Cr(1) bond lengths are 3.21 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cr(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, corners with eight equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(7)Mg11Cr cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.21 Å. Both Mg(1)-Mg(6) bond lengths are 3.13 Å. There are two shorter (3.18 Å) and two longer (3.20 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5) bond lengths are 3.18 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Na(1)Mg10Cr2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, corners with eight equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(6)NaMg11 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.18 Å. All Mg(2)-Mg(4) bond lengths are 3.19 Å. All Mg(2)-Mg(5) bond lengths are 3.14 Å. In the third Mg site, Mg(3) is bonded to two equivalent Na(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Cr(1) atoms to form distorted MgNa2Mg8Cr2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with six equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Cr(1)Na2Mg10 cuboctahedra, and faces with eight equivalent Mg(5)NaMg10Cr cuboctahedra. Both Mg(3)-Mg(3) bond lengths are 3.21 Å. Both Mg(3)-Mg(5) bond lengths are 3.15 Å. Both Mg(3)-Mg(6) bond lengths are 3.20 Å. Both Mg(3)-Mg(7) bond lengths are 3.13 Å. There is one shorter (3.18 Å) and one longer (3.20 Å) Mg(3)-Cr(1) bond length. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Na(1)Mg10Cr2 cuboctahedra, corners with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, corners with four equivalent Cr(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra, edges with four equivalent Mg(6)NaMg11 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, and faces with eight equivalent Mg(5)NaMg10Cr cuboctahedra. There is one shorter (3.20 Å) and one longer (3.21 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.16 Å. Both Mg(4)-Mg(6) bond lengths are 3.12 Å. Both Mg(4)-Mg(7) bond lengths are 3.20 Å. In the fifth Mg site, Mg(5) is bonded to one Na(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Cr(1) atom to form distorted MgNaMg10Cr cuboctahedra that share corners with four equivalent Mg(7)Mg11Cr cuboctahedra, corners with four equivalent Mg(6)NaMg11 cuboctahedra, corners with ten equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(7)Mg11Cr cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with two equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Mg(6)NaMg11 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra,  a faceface with one Na(1)Mg10Cr2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra,  a faceface with one Cr(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. There is one shorter (3.14 Å) and one longer (3.27 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.17 Å) and one longer (3.21 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.14 Å) and one longer (3.23 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Cr(1) bond length is 3.14 Å. In the sixth Mg site, Mg(6) is bonded to one Na(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms to form distorted MgNaMg11 cuboctahedra that share corners with four equivalent Mg(7)Mg11Cr cuboctahedra, corners with six equivalent Mg(6)NaMg11 cuboctahedra, corners with eight equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with two equivalent Mg(7)Mg11Cr cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra,  a faceface with one Na(1)Mg10Cr2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with three equivalent Mg(2)Mg12 cuboctahedra, faces with three equivalent Cr(1)Na2Mg10 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. Both Mg(6)-Mg(7) bond lengths are 3.21 Å. In the seventh Mg site, Mg(7) is bonded to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(6), four equivalent Mg(5), and one Cr(1) atom to form distorted MgMg11Cr cuboctahedra that share corners with four equivalent Mg(6)NaMg11 cuboctahedra, corners with six equivalent Mg(7)Mg11Cr cuboctahedra, corners with eight equivalent Mg(5)NaMg10Cr cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(6)NaMg11 cuboctahedra, edges with two equivalent Cr(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with four equivalent Mg(5)NaMg10Cr cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra,  a faceface with one Cr(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with two equivalent Mg(6)NaMg11 cuboctahedra, faces with three equivalent Na(1)Mg10Cr2 cuboctahedra, faces with three equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(5)NaMg10Cr cuboctahedra. The Mg(7)-Cr(1) bond length is 3.11 Å. Cr(1) is bonded to two equivalent Na(1), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form CrNa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Cr(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Na(1)Mg10Cr2 cuboctahedra, edges with four equivalent Mg(7)Mg11Cr cuboctahedra, edges with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, edges with eight equivalent Mg(5)NaMg10Cr cuboctahedra, faces with two equivalent Na(1)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(7)Mg11Cr cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, faces with four equivalent Mg(3)Na2Mg8Cr2 cuboctahedra, faces with four equivalent Mg(5)NaMg10Cr cuboctahedra, and faces with six equivalent Mg(6)NaMg11 cuboctahedra.