UBe13 crystallizes in the cubic Fm-3c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one Be(2), nine equivalent Be(1), and two equivalent U(1) atoms to form distorted BeU2Be10 cuboctahedra that share  a cornercorner with one Be(2)Be12 cuboctahedra, corners with twenty-seven equivalent Be(1)U2Be10 cuboctahedra, edges with eight equivalent Be(1)U2Be10 cuboctahedra, faces with two equivalent Be(2)Be12 cuboctahedra, and faces with twenty-three equivalent Be(1)U2Be10 cuboctahedra. In the second Be site, Be(2) is bonded to twelve equivalent Be(1) atoms to form a mixture of corner and face-sharing BeBe12 cuboctahedra. U(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Be(1) atoms.
UBe13 crystallizes in the cubic Fm-3c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one Be(2), nine equivalent Be(1), and two equivalent U(1) atoms to form distorted BeU2Be10 cuboctahedra that share  a cornercorner with one Be(2)Be12 cuboctahedra, corners with twenty-seven equivalent Be(1)U2Be10 cuboctahedra, edges with eight equivalent Be(1)U2Be10 cuboctahedra, faces with two equivalent Be(2)Be12 cuboctahedra, and faces with twenty-three equivalent Be(1)U2Be10 cuboctahedra. The Be(1)-Be(2) bond length is 2.15 Å. There are eight shorter (2.24 Å) and one longer (2.34 Å) Be(1)-Be(1) bond length. Both Be(1)-U(1) bond lengths are 3.01 Å. In the second Be site, Be(2) is bonded to twelve equivalent Be(1) atoms to form a mixture of corner and face-sharing BeBe12 cuboctahedra. U(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Be(1) atoms.