Rb2In4O7 crystallizes in the trigonal P-31m space group. Rb(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(2) and three equivalent O(1) atoms to form InO4 tetrahedra that share corners with six equivalent In(2)O6 octahedra and  a cornercorner with one In(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 62°. In the second In site, In(2) is bonded to six equivalent O(1) atoms to form InO6 octahedra that share corners with six equivalent In(1)O4 tetrahedra and edges with three equivalent In(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one In(1), and two equivalent In(2) atoms. In the second O site, O(2) is bonded in a linear geometry to six equivalent Rb(1) and two equivalent In(1) atoms.
Rb2In4O7 crystallizes in the trigonal P-31m space group. Rb(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. All Rb(1)-O(2) bond lengths are 3.27 Å. All Rb(1)-O(1) bond lengths are 3.06 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(2) and three equivalent O(1) atoms to form InO4 tetrahedra that share corners with six equivalent In(2)O6 octahedra and  a cornercorner with one In(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 62°. The In(1)-O(2) bond length is 2.03 Å. All In(1)-O(1) bond lengths are 2.07 Å. In the second In site, In(2) is bonded to six equivalent O(1) atoms to form InO6 octahedra that share corners with six equivalent In(1)O4 tetrahedra and edges with three equivalent In(2)O6 octahedra. All In(2)-O(1) bond lengths are 2.19 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one In(1), and two equivalent In(2) atoms. In the second O site, O(2) is bonded in a linear geometry to six equivalent Rb(1) and two equivalent In(1) atoms.