RbUCrO6 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(2), one O(5), two equivalent O(4), three equivalent O(1), and three equivalent O(3) atoms. U(1) is bonded to one O(3), one O(4), one O(5), two equivalent O(2), and two equivalent O(6) atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent U(1)O7 pentagonal bipyramids, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one U(1)O7 pentagonal bipyramid, and edges with two equivalent Cr(1)O5 trigonal bipyramids. Cr(1) is bonded to one O(1), one O(2), one O(6), and two equivalent O(5) atoms to form distorted CrO5 trigonal bipyramids that share corners with two equivalent U(1)O7 pentagonal bipyramids, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Cr(1)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent U(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to three equivalent Rb(1) and one U(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one U(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one U(1), and two equivalent Cr(1) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Cr(1) atom.
RbUCrO6 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(2), one O(5), two equivalent O(4), three equivalent O(1), and three equivalent O(3) atoms. The Rb(1)-O(2) bond length is 3.32 Å. The Rb(1)-O(5) bond length is 3.40 Å. There is one shorter (2.90 Å) and one longer (3.07 Å) Rb(1)-O(4) bond length. There are a spread of Rb(1)-O(1) bond distances ranging from 3.04-3.30 Å. There are a spread of Rb(1)-O(3) bond distances ranging from 3.25-3.55 Å. U(1) is bonded to one O(3), one O(4), one O(5), two equivalent O(2), and two equivalent O(6) atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent U(1)O7 pentagonal bipyramids, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one U(1)O7 pentagonal bipyramid, and edges with two equivalent Cr(1)O5 trigonal bipyramids. The U(1)-O(3) bond length is 1.84 Å. The U(1)-O(4) bond length is 1.84 Å. The U(1)-O(5) bond length is 2.39 Å. Both U(1)-O(2) bond lengths are 2.36 Å. There is one shorter (2.32 Å) and one longer (2.35 Å) U(1)-O(6) bond length. Cr(1) is bonded to one O(1), one O(2), one O(6), and two equivalent O(5) atoms to form distorted CrO5 trigonal bipyramids that share corners with two equivalent U(1)O7 pentagonal bipyramids, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Cr(1)O5 trigonal bipyramid. The Cr(1)-O(1) bond length is 1.61 Å. The Cr(1)-O(2) bond length is 1.85 Å. The Cr(1)-O(6) bond length is 1.85 Å. There is one shorter (1.89 Å) and one longer (1.91 Å) Cr(1)-O(5) bond length. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent U(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to three equivalent Rb(1) and one U(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one U(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one U(1), and two equivalent Cr(1) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Cr(1) atom.