Rb2LiAsO4 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(1)O4 tetrahedra. As(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form AsO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and  an edgeedge with one Li(1)O4 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(2), two equivalent Rb(1), one Li(1), and one As(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), and one As(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), and one As(1) atom.
Rb2LiAsO4 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Rb(1)-O(2) bond lengths are 3.08 Å. There is one shorter (2.91 Å) and one longer (3.08 Å) Rb(1)-O(3) bond length. There are two shorter (3.10 Å) and two longer (3.28 Å) Rb(1)-O(1) bond lengths. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Rb(2)-O(1) bond lengths are 3.08 Å. There is one shorter (2.89 Å) and one longer (3.07 Å) Rb(2)-O(2) bond length. Both Rb(2)-O(3) bond lengths are 3.06 Å. Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(1)O4 tetrahedra. The Li(1)-O(2) bond length is 2.06 Å. The Li(1)-O(3) bond length is 2.08 Å. Both Li(1)-O(1) bond lengths are 1.92 Å. As(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form AsO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and  an edgeedge with one Li(1)O4 tetrahedra. The As(1)-O(2) bond length is 1.74 Å. The As(1)-O(3) bond length is 1.74 Å. Both As(1)-O(1) bond lengths are 1.72 Å. 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(2), two equivalent Rb(1), one Li(1), and one As(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), and one As(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), and one As(1) atom.