RbSi2O5 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Rb(1) and two equivalent Si(1) atoms.
RbSi2O5 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), and four equivalent O(2) atoms. The Rb(1)-O(3) bond length is 3.37 Å. Both Rb(1)-O(1) bond lengths are 2.98 Å. There are two shorter (2.86 Å) and two longer (2.87 Å) Rb(1)-O(2) bond lengths. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. The Si(1)-O(2) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.65 Å. There is one shorter (1.64 Å) and one longer (1.65 Å) Si(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Rb(1) and two equivalent Si(1) atoms.