CsMg14Sb crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Sb(1) atoms to form CsMg10Sb2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Cs(1)Mg10Sb2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Sb(1)Cs2Mg10 cuboctahedra, edges with four equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with two equivalent Sb(1)Cs2Mg10 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 Sb(1)Cs2Mg10 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(6)CsMg11 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 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 Cs(1)Mg10Sb2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Sb(1)Cs2Mg10 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(6)CsMg11 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 3-coordinate geometry to two equivalent Cs(1), two equivalent Mg(6), and two equivalent Sb(1) atoms. 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 distorted MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Sb2 cuboctahedra, corners with four equivalent Sb(1)Cs2Mg10 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(6)CsMg11 cuboctahedra, faces with two equivalent Mg(6)CsMg11 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 2-coordinate geometry to one Cs(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(6), and one Sb(1) atom. In the sixth Mg site, Mg(6) is bonded to one Cs(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 MgCsMg11 cuboctahedra that share corners with six equivalent Mg(6)CsMg11 cuboctahedra, edges with two equivalent Cs(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra,  a faceface with one Cs(1)Mg10Sb2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Mg(2)Mg12 cuboctahedra, and faces with three equivalent Sb(1)Cs2Mg10 cuboctahedra. In the seventh Mg site, Mg(7) is bonded in a distorted single-bond geometry to one Mg(2), two equivalent Mg(4), two equivalent Mg(6), and one Sb(1) atom. Sb(1) is bonded to two equivalent Cs(1), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form distorted SbCs2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Sb(1)Cs2Mg10 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with six equivalent Mg(6)CsMg11 cuboctahedra.
CsMg14Sb crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Sb(1) atoms to form CsMg10Sb2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Cs(1)Mg10Sb2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Sb(1)Cs2Mg10 cuboctahedra, edges with four equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with two equivalent Sb(1)Cs2Mg10 cuboctahedra. Both Cs(1)-Mg(6) bond lengths are 3.49 Å. There are two shorter (3.32 Å) and two longer (3.34 Å) Cs(1)-Mg(3) bond lengths. All Cs(1)-Mg(5) bond lengths are 3.47 Å. Both Cs(1)-Sb(1) bond lengths are 3.37 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 Sb(1)Cs2Mg10 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(6)CsMg11 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.37 Å. Both Mg(1)-Mg(6) bond lengths are 3.17 Å. There are two shorter (3.32 Å) and two longer (3.33 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 Cs(1)Mg10Sb2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Sb(1)Cs2Mg10 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(6)CsMg11 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.32 Å. There are two shorter (3.26 Å) and two longer (3.40 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.11 Å. In the third Mg site, Mg(3) is bonded in a 3-coordinate geometry to two equivalent Cs(1), two equivalent Mg(6), and two equivalent Sb(1) atoms. Both Mg(3)-Mg(6) bond lengths are 3.39 Å. There is one shorter (3.15 Å) and one longer (3.50 Å) Mg(3)-Sb(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 distorted MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Sb2 cuboctahedra, corners with four equivalent Sb(1)Cs2Mg10 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(6)CsMg11 cuboctahedra, faces with two equivalent Mg(6)CsMg11 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 (3.45 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.12 Å. Both Mg(4)-Mg(6) bond lengths are 3.11 Å. Both Mg(4)-Mg(7) bond lengths are 3.31 Å. In the fifth Mg site, Mg(5) is bonded in a 2-coordinate geometry to one Cs(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(6), and one Sb(1) atom. There is one shorter (3.20 Å) and one longer (3.46 Å) Mg(5)-Mg(6) bond length. The Mg(5)-Sb(1) bond length is 3.36 Å. In the sixth Mg site, Mg(6) is bonded to one Cs(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 MgCsMg11 cuboctahedra that share corners with six equivalent Mg(6)CsMg11 cuboctahedra, edges with two equivalent Cs(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra,  a faceface with one Cs(1)Mg10Sb2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(6)CsMg11 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Mg(2)Mg12 cuboctahedra, and faces with three equivalent Sb(1)Cs2Mg10 cuboctahedra. Both Mg(6)-Mg(7) bond lengths are 3.38 Å. In the seventh Mg site, Mg(7) is bonded in a distorted single-bond geometry to one Mg(2), two equivalent Mg(4), two equivalent Mg(6), and one Sb(1) atom. The Mg(7)-Sb(1) bond length is 3.30 Å. Sb(1) is bonded to two equivalent Cs(1), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form distorted SbCs2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Sb(1)Cs2Mg10 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Cs(1)Mg10Sb2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with six equivalent Mg(6)CsMg11 cuboctahedra.