U2Co3O8 is beta indium sulfide-derived structured and crystallizes in the orthorhombic Pnnm space group. U(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form UO6 octahedra that share corners with three equivalent Co(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-64°. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CoO6 octahedra that share corners with six equivalent U(1)O6 octahedra, edges with two equivalent U(1)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-64°. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent U(1)O6 octahedra, edges with two equivalent U(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one Co(1), and two equivalent Co(2) atoms to form a mixture of distorted corner and edge-sharing OUCo3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one U(1) and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent U(1), one Co(1), and one Co(2) atom.
U2Co3O8 is beta indium sulfide-derived structured and crystallizes in the orthorhombic Pnnm space group. U(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form UO6 octahedra that share corners with three equivalent Co(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-64°. The U(1)-O(1) bond length is 2.11 Å. The U(1)-O(2) bond length is 2.01 Å. There are two shorter (2.25 Å) and two longer (2.28 Å) U(1)-O(3) bond lengths. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CoO6 octahedra that share corners with six equivalent U(1)O6 octahedra, edges with two equivalent U(1)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-64°. Both Co(1)-O(1) bond lengths are 1.93 Å. All Co(1)-O(3) bond lengths are 2.37 Å. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent U(1)O6 octahedra, edges with two equivalent U(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. Both Co(2)-O(1) bond lengths are 2.12 Å. Both Co(2)-O(2) bond lengths are 2.01 Å. Both Co(2)-O(3) bond lengths are 2.19 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one Co(1), and two equivalent Co(2) atoms to form a mixture of distorted corner and edge-sharing OUCo3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one U(1) and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent U(1), one Co(1), and one Co(2) atom.