Rb3InO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted RbO5 trigonal bipyramids that share corners with four equivalent In(1)O4 tetrahedra, corners with two equivalent Rb(1)O5 trigonal bipyramids,  an edgeedge with one In(1)O4 tetrahedra, and  an edgeedge with one Rb(1)O5 trigonal bipyramid. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form InO4 tetrahedra that share corners with four equivalent Rb(1)O5 trigonal bipyramids,  an edgeedge with one In(1)O4 tetrahedra, and  an edgeedge with one Rb(1)O5 trigonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one In(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and two equivalent In(1) atoms. In the third O site, O(3) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one In(1) atom.
Rb3InO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted RbO5 trigonal bipyramids that share corners with four equivalent In(1)O4 tetrahedra, corners with two equivalent Rb(1)O5 trigonal bipyramids,  an edgeedge with one In(1)O4 tetrahedra, and  an edgeedge with one Rb(1)O5 trigonal bipyramid. The Rb(1)-O(2) bond length is 3.07 Å. There is one shorter (2.77 Å) and one longer (3.02 Å) Rb(1)-O(1) bond length. There is one shorter (2.97 Å) and one longer (2.98 Å) Rb(1)-O(3) bond length. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Rb(2)-O(2) bond length is 3.09 Å. Both Rb(2)-O(1) bond lengths are 2.91 Å. There is one shorter (2.80 Å) and one longer (3.14 Å) Rb(2)-O(3) bond length. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Rb(3)-O(2) bond length is 2.67 Å. There is one shorter (2.85 Å) and one longer (3.38 Å) Rb(3)-O(1) bond length. There is one shorter (2.91 Å) and one longer (3.25 Å) Rb(3)-O(3) bond length. In(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form InO4 tetrahedra that share corners with four equivalent Rb(1)O5 trigonal bipyramids,  an edgeedge with one In(1)O4 tetrahedra, and  an edgeedge with one Rb(1)O5 trigonal bipyramid. The In(1)-O(1) bond length is 2.05 Å. The In(1)-O(3) bond length is 2.05 Å. There is one shorter (2.12 Å) and one longer (2.14 Å) In(1)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one In(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and two equivalent In(1) atoms. In the third O site, O(3) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one In(1) atom.