RbKV2MnO7 crystallizes in the tetragonal P4_2/mnm space group. Rb(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. V(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form VO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra and corners with two equivalent Mn(1)O4 tetrahedra. Mn(1) is bonded to four equivalent O(2) atoms to form MnO4 tetrahedra that share corners with four equivalent V(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one K(1), and one V(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent V(1) atoms. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), one K(1), one V(1), and one Mn(1) atom.
RbKV2MnO7 crystallizes in the tetragonal P4_2/mnm space group. Rb(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. All Rb(1)-O(2) bond lengths are 2.98 Å. All Rb(1)-O(3) bond lengths are 3.04 Å. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both K(1)-O(1) bond lengths are 2.89 Å. Both K(1)-O(3) bond lengths are 2.77 Å. All K(1)-O(2) bond lengths are 3.21 Å. V(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form VO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra and corners with two equivalent Mn(1)O4 tetrahedra. The V(1)-O(1) bond length is 1.84 Å. The V(1)-O(3) bond length is 1.68 Å. Both V(1)-O(2) bond lengths are 1.74 Å. Mn(1) is bonded to four equivalent O(2) atoms to form MnO4 tetrahedra that share corners with four equivalent V(1)O4 tetrahedra. All Mn(1)-O(2) bond lengths are 2.06 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one K(1), and one V(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent V(1) atoms. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), one K(1), one V(1), and one Mn(1) atom.