CsMg14Ni crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(7), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Ni(1) atoms to form distorted CsMg10Ni2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Cs(1)Mg10Ni2 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni 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 distorted MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Ni2 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni 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 six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Cs(1)Mg10Ni2 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Mg(5), and one Ni(1) atom. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and two equivalent Mg(7) atoms. In the fifth Mg site, Mg(5) is bonded 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 Ni(1) atom to form distorted MgCsMg10Ni cuboctahedra that share corners with ten equivalent Mg(5)CsMg10Ni cuboctahedra, edges with two equivalent Cs(1)Mg10Ni2 cuboctahedra, edges with two equivalent Mg(5)CsMg10Ni cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra,  a faceface with one Cs(1)Mg10Ni2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. In the sixth Mg site, Mg(6) is bonded in a distorted single-bond geometry to one Mg(1), two equivalent Mg(7), four equivalent Mg(5), and one Ni(1) atom. In the seventh Mg site, Mg(7) is bonded in a 10-coordinate geometry to one Cs(1), one Mg(2), two equivalent Mg(4), two equivalent Mg(6), and four equivalent Mg(5) atoms. Ni(1) is bonded in a 10-coordinate geometry to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(6), and four equivalent Mg(5) atoms.
CsMg14Ni crystallizes in the orthorhombic Amm2 space group. Cs(1) is bonded to two equivalent Mg(7), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Ni(1) atoms to form distorted CsMg10Ni2 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Cs(1)Mg10Ni2 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. Both Cs(1)-Mg(7) bond lengths are 3.37 Å. There are two shorter (3.28 Å) and two longer (3.31 Å) Cs(1)-Mg(3) bond lengths. All Cs(1)-Mg(5) bond lengths are 3.54 Å. Both Cs(1)-Ni(1) bond lengths are 3.23 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 distorted MgMg12 cuboctahedra that share corners with four equivalent Cs(1)Mg10Ni2 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.15 Å. Both Mg(1)-Mg(6) bond lengths are 3.51 Å. There are two shorter (3.24 Å) and two longer (3.35 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5) bond lengths are 3.20 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 six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with eight equivalent Mg(5)CsMg10Ni cuboctahedra, faces with two equivalent Cs(1)Mg10Ni2 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.09 Å. There are two shorter (3.21 Å) and two longer (3.37 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.21 Å. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Mg(5), and one Ni(1) atom. Both Mg(3)-Mg(5) bond lengths are 3.12 Å. The Mg(3)-Ni(1) bond length is 2.66 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and two equivalent Mg(7) atoms. There is one shorter (3.06 Å) and one longer (3.25 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.16 Å. Both Mg(4)-Mg(7) bond lengths are 3.02 Å. In the fifth Mg site, Mg(5) is bonded 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 Ni(1) atom to form distorted MgCsMg10Ni cuboctahedra that share corners with ten equivalent Mg(5)CsMg10Ni cuboctahedra, edges with two equivalent Cs(1)Mg10Ni2 cuboctahedra, edges with two equivalent Mg(5)CsMg10Ni cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra,  a faceface with one Cs(1)Mg10Ni2 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(5)CsMg10Ni cuboctahedra. There is one shorter (3.06 Å) and one longer (3.24 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.22 Å) and one longer (3.44 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.18 Å) and one longer (3.42 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Ni(1) bond length is 3.26 Å. In the sixth Mg site, Mg(6) is bonded in a distorted single-bond geometry to one Mg(1), two equivalent Mg(7), four equivalent Mg(5), and one Ni(1) atom. Both Mg(6)-Mg(7) bond lengths are 3.24 Å. The Mg(6)-Ni(1) bond length is 3.06 Å. In the seventh Mg site, Mg(7) is bonded in a 10-coordinate geometry to one Cs(1), one Mg(2), two equivalent Mg(4), two equivalent Mg(6), and four equivalent Mg(5) atoms. Ni(1) is bonded in a 10-coordinate geometry to two equivalent Cs(1), two equivalent Mg(3), two equivalent Mg(6), and four equivalent Mg(5) atoms.