U(FeZn10)2 crystallizes in the cubic Fd-3m space group. U(1) is bonded in a 16-coordinate geometry to four equivalent Zn(1) and twelve equivalent Zn(3) atoms. Fe(1) is bonded to six equivalent Zn(2) and six equivalent Zn(3) atoms to form FeZn12 cuboctahedra that share corners with six equivalent Fe(1)Zn12 cuboctahedra, edges with eighteen equivalent Zn(3)UZn10Fe cuboctahedra, and faces with six equivalent Zn(3)UZn10Fe cuboctahedra. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 14-coordinate geometry to two equivalent U(1) and twelve equivalent Zn(3) atoms. In the second Zn site, Zn(2) is bonded in a 12-coordinate geometry to two equivalent Fe(1), four equivalent Zn(2), and six equivalent Zn(3) atoms. In the third Zn site, Zn(3) is bonded to one U(1), one Fe(1), two equivalent Zn(1), three equivalent Zn(2), and five equivalent Zn(3) atoms to form distorted ZnUZn10Fe cuboctahedra that share corners with fifteen equivalent Zn(3)UZn10Fe cuboctahedra, edges with two equivalent Zn(3)UZn10Fe cuboctahedra, edges with three equivalent Fe(1)Zn12 cuboctahedra,  a faceface with one Fe(1)Zn12 cuboctahedra, and faces with fifteen equivalent Zn(3)UZn10Fe cuboctahedra.
U(FeZn10)2 crystallizes in the cubic Fd-3m space group. U(1) is bonded in a 16-coordinate geometry to four equivalent Zn(1) and twelve equivalent Zn(3) atoms. All U(1)-Zn(1) bond lengths are 3.05 Å. All U(1)-Zn(3) bond lengths are 3.12 Å. Fe(1) is bonded to six equivalent Zn(2) and six equivalent Zn(3) atoms to form FeZn12 cuboctahedra that share corners with six equivalent Fe(1)Zn12 cuboctahedra, edges with eighteen equivalent Zn(3)UZn10Fe cuboctahedra, and faces with six equivalent Zn(3)UZn10Fe cuboctahedra. All Fe(1)-Zn(2) bond lengths are 2.49 Å. All Fe(1)-Zn(3) bond lengths are 2.72 Å. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 14-coordinate geometry to two equivalent U(1) and twelve equivalent Zn(3) atoms. All Zn(1)-Zn(3) bond lengths are 3.01 Å. In the second Zn site, Zn(2) is bonded in a 12-coordinate geometry to two equivalent Fe(1), four equivalent Zn(2), and six equivalent Zn(3) atoms. All Zn(2)-Zn(2) bond lengths are 2.70 Å. There are two shorter (2.65 Å) and four longer (2.77 Å) Zn(2)-Zn(3) bond lengths. In the third Zn site, Zn(3) is bonded to one U(1), one Fe(1), two equivalent Zn(1), three equivalent Zn(2), and five equivalent Zn(3) atoms to form distorted ZnUZn10Fe cuboctahedra that share corners with fifteen equivalent Zn(3)UZn10Fe cuboctahedra, edges with two equivalent Zn(3)UZn10Fe cuboctahedra, edges with three equivalent Fe(1)Zn12 cuboctahedra,  a faceface with one Fe(1)Zn12 cuboctahedra, and faces with fifteen equivalent Zn(3)UZn10Fe cuboctahedra. There are a spread of Zn(3)-Zn(3) bond distances ranging from 2.63-2.83 Å.