CsMg14Zr crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(7); four Mg(3,3); four Mg(5,5,5); and two equivalent Zr(1) atoms to form CsMg10Zr2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with eight Mg(4,4)Mg12 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra; faces with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; and faces with six equivalent Mg(6)Mg11Zr cuboctahedra. There are twelve inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2); two equivalent Mg(6); four Mg(4,4); and four Mg(5,5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with eight Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra; faces with four Mg(4,4)Mg12 cuboctahedra; and faces with six equivalent Mg(7)CsMg11 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1); two equivalent Mg(7); four Mg(4,4); and four Mg(5,5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; corners with eight Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four Mg(4,4)Mg12 cuboctahedra; and faces with six equivalent Mg(6)Mg11Zr cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Zr(1) atoms to form distorted MgCs2Mg8Zr2 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)Cs2Mg8Zr2 cuboctahedra, edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra, edges with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra, edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra, edges with four equivalent Mg(7)CsMg11 cuboctahedra, edges with four equivalent Mg(6)Mg11Zr cuboctahedra, faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra, faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(7)CsMg11 cuboctahedra, faces with two equivalent Mg(6)Mg11Zr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with two equivalent Zr(1)Cs2Mg10 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 Cs(1)Mg10Zr2 cuboctahedra; corners with four equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six Mg(4,4)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)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; and faces with two equivalent Mg(4)Mg12 cuboctahedra. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. In the sixth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. In the seventh Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. In the eighth Mg site, Mg(6) is bonded to one Mg(1); two Mg(3,3); two Mg(4,4); two equivalent Mg(7); four Mg(5,5,5,5); and one Zr(1) atom to form MgMg11Zr cuboctahedra that share corners with four equivalent Mg(7)CsMg11 cuboctahedra; corners with six equivalent Mg(6)Mg11Zr cuboctahedra; edges with two equivalent Mg(7)CsMg11 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Zr(1)Cs2Mg10 cuboctahedra; faces with two Mg(3,3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two Mg(4,4)Mg12 cuboctahedra; faces with three equivalent Cs(1)Mg10Zr2 cuboctahedra; and faces with three equivalent Mg(2)Mg12 cuboctahedra. In the ninth Mg site, Mg(7) is bonded to one Cs(1); one Mg(2); two Mg(3,3); two Mg(4,4); two equivalent Mg(6); and four Mg(5,5,5,5) atoms to form distorted MgCsMg11 cuboctahedra that share corners with four equivalent Mg(6)Mg11Zr cuboctahedra; corners with six equivalent Mg(7)CsMg11 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with two equivalent Mg(6)Mg11Zr cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra;  a faceface with one Cs(1)Mg10Zr2 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra; faces with two Mg(3,3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two Mg(4,4)Mg12 cuboctahedra; faces with three equivalent Mg(1)Mg12 cuboctahedra; and faces with three equivalent Zr(1)Cs2Mg10 cuboctahedra. In the tenth Mg site, Mg(4) is bonded to two equivalent Mg(1); two equivalent Mg(2); two equivalent Mg(4); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with four equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six Mg(4,4)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)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; and faces with two equivalent Mg(4)Mg12 cuboctahedra. In the eleventh Mg site, Mg(3) is bonded to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Zr(1) atoms to form distorted MgCs2Mg8Zr2 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 Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; and faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra. In the twelfth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. Zr(1) is bonded to two equivalent Cs(1); two equivalent Mg(6); four Mg(3,3); and four Mg(5,5,5) atoms to form distorted ZrCs2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with eight Mg(4,4)Mg12 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; and faces with six equivalent Mg(7)CsMg11 cuboctahedra.
CsMg14Zr crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(7); four Mg(3,3); four Mg(5,5,5); and two equivalent Zr(1) atoms to form CsMg10Zr2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with eight Mg(4,4)Mg12 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra; faces with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; and faces with six equivalent Mg(6)Mg11Zr cuboctahedra. Both Cs(1)-Mg(7) bond lengths are 3.44 Å. There are two shorter (3.28 Å) and two longer (3.30 Å) Cs(1)-Mg(3,3) bond lengths. All Cs(1)-Mg(5,5,5) bond lengths are 3.43 Å. Both Cs(1)-Zr(1) bond lengths are 3.34 Å. There are twelve inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2); two equivalent Mg(6); four Mg(4,4); and four Mg(5,5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with eight Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra; faces with four Mg(4,4)Mg12 cuboctahedra; and faces with six equivalent Mg(7)CsMg11 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.34 Å. Both Mg(1)-Mg(6) bond lengths are 3.26 Å. There are two shorter (3.26 Å) and two longer (3.31 Å) Mg(1)-Mg(4,4) bond lengths. All Mg(1)-Mg(5,5,5) bond lengths are 3.12 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1); two equivalent Mg(7); four Mg(4,4); and four Mg(5,5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; corners with eight Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four Mg(4,4)Mg12 cuboctahedra; and faces with six equivalent Mg(6)Mg11Zr cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.17 Å. There are two shorter (3.27 Å) and two longer (3.30 Å) Mg(2)-Mg(4,4) bond lengths. All Mg(2)-Mg(5,5,5) bond lengths are 3.21 Å. In the third Mg site, Mg(3) is bonded to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Zr(1) atoms to form distorted MgCs2Mg8Zr2 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)Cs2Mg8Zr2 cuboctahedra, edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra, edges with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra, edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra, edges with four equivalent Mg(7)CsMg11 cuboctahedra, edges with four equivalent Mg(6)Mg11Zr cuboctahedra, faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra, faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(7)CsMg11 cuboctahedra, faces with two equivalent Mg(6)Mg11Zr cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra. There is one shorter (3.32 Å) and one longer (3.35 Å) Mg(3)-Mg(3) bond length. Both Mg(3)-Mg(5) bond lengths are 3.34 Å. Both Mg(3)-Mg(6) bond lengths are 3.23 Å. Both Mg(3)-Mg(7) bond lengths are 3.39 Å. There is one shorter (3.19 Å) and one longer (3.39 Å) Mg(3)-Zr(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 Cs(1)Mg10Zr2 cuboctahedra; corners with four equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six Mg(4,4)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)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; and faces with two equivalent Mg(4)Mg12 cuboctahedra. There is one shorter (3.29 Å) and one longer (3.38 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.14 Å. Both Mg(4)-Mg(6) bond lengths are 3.29 Å. Both Mg(4)-Mg(7) bond lengths are 3.10 Å. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. The Mg(5)-Cs(1) bond length is 3.43 Å. The Mg(5)-Mg(1) bond length is 3.12 Å. The Mg(5)-Mg(2) bond length is 3.21 Å. There is one shorter (3.14 Å) and one longer (3.53 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.23 Å) and one longer (3.35 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.14 Å) and one longer (3.43 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Zr(1) bond length is 3.29 Å. In the sixth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. The Mg(5)-Mg(3) bond length is 3.34 Å. The Mg(5)-Mg(4) bond length is 3.14 Å. There is one shorter (3.14 Å) and one longer (3.53 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.23 Å) and one longer (3.35 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.14 Å) and one longer (3.43 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Zr(1) bond length is 3.29 Å. In the seventh Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. The Mg(5)-Mg(3) bond length is 3.34 Å. The Mg(5)-Mg(4) bond length is 3.14 Å. There is one shorter (3.14 Å) and one longer (3.53 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.23 Å) and one longer (3.35 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.14 Å) and one longer (3.43 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Zr(1) bond length is 3.29 Å. In the eighth Mg site, Mg(6) is bonded to one Mg(1); two Mg(3,3); two Mg(4,4); two equivalent Mg(7); four Mg(5,5,5,5); and one Zr(1) atom to form MgMg11Zr cuboctahedra that share corners with four equivalent Mg(7)CsMg11 cuboctahedra; corners with six equivalent Mg(6)Mg11Zr cuboctahedra; edges with two equivalent Mg(7)CsMg11 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Zr(1)Cs2Mg10 cuboctahedra; faces with two Mg(3,3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two Mg(4,4)Mg12 cuboctahedra; faces with three equivalent Cs(1)Mg10Zr2 cuboctahedra; and faces with three equivalent Mg(2)Mg12 cuboctahedra. The Mg(6)-Mg(3) bond length is 3.23 Å. The Mg(6)-Mg(4) bond length is 3.29 Å. Both Mg(6)-Mg(7) bond lengths are 3.35 Å. The Mg(6)-Mg(5) bond length is 3.23 Å. The Mg(6)-Zr(1) bond length is 3.26 Å. In the ninth Mg site, Mg(7) is bonded to one Cs(1); one Mg(2); two Mg(3,3); two Mg(4,4); two equivalent Mg(6); and four Mg(5,5,5,5) atoms to form distorted MgCsMg11 cuboctahedra that share corners with four equivalent Mg(6)Mg11Zr cuboctahedra; corners with six equivalent Mg(7)CsMg11 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with two equivalent Mg(6)Mg11Zr cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four Mg(4,4)Mg12 cuboctahedra;  a faceface with one Cs(1)Mg10Zr2 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra; faces with two Mg(3,3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two Mg(4,4)Mg12 cuboctahedra; faces with three equivalent Mg(1)Mg12 cuboctahedra; and faces with three equivalent Zr(1)Cs2Mg10 cuboctahedra. The Mg(7)-Mg(3) bond length is 3.39 Å. The Mg(7)-Mg(4) bond length is 3.10 Å. The Mg(7)-Mg(5) bond length is 3.43 Å. In the tenth Mg site, Mg(4) is bonded to two equivalent Mg(1); two equivalent Mg(2); two equivalent Mg(4); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Zr2 cuboctahedra; corners with four equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; corners with four equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with six Mg(4,4)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)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; and faces with two equivalent Mg(4)Mg12 cuboctahedra. Both Mg(4)-Mg(5,5) bond lengths are 3.14 Å. In the eleventh Mg site, Mg(3) is bonded to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Zr(1) atoms to form distorted MgCs2Mg8Zr2 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 Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; edges with two equivalent Zr(1)Cs2Mg10 cuboctahedra; edges with four equivalent Mg(7)CsMg11 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(3)Cs2Mg8Zr2 cuboctahedra; faces with two equivalent Mg(7)CsMg11 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; and faces with two equivalent Zr(1)Cs2Mg10 cuboctahedra. Both Mg(3)-Mg(5) bond lengths are 3.34 Å. There is one shorter (3.19 Å) and one longer (3.39 Å) Mg(3)-Zr(1) bond length. In the twelfth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Cs(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 Zr(1) atom. The Mg(5)-Mg(3) bond length is 3.34 Å. The Mg(5)-Zr(1) bond length is 3.29 Å. Zr(1) is bonded to two equivalent Cs(1); two equivalent Mg(6); four Mg(3,3); and four Mg(5,5,5) atoms to form distorted ZrCs2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Zr(1)Cs2Mg10 cuboctahedra; corners with eight Mg(4,4)Mg12 cuboctahedra; edges with two equivalent Cs(1)Mg10Zr2 cuboctahedra; edges with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; edges with four equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Cs(1)Mg10Zr2 cuboctahedra; faces with two equivalent Mg(6)Mg11Zr cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four Mg(3,3)Cs2Mg8Zr2 cuboctahedra; and faces with six equivalent Mg(7)CsMg11 cuboctahedra.