Rb2Li2GeO4 crystallizes in the triclinic P-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(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(2) atoms. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ge(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Li(2)O4 trigonal pyramids and  an edgeedge with one Li(2)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), one Li(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(2), two equivalent Li(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Rb(1), four equivalent Rb(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(1), two equivalent Li(2), and one Ge(1) atom.
Rb2Li2GeO4 crystallizes in the triclinic P-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(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (3.21 Å) and one longer (3.35 Å) Rb(1)-O(1) bond length. There is one shorter (2.91 Å) and one longer (3.35 Å) Rb(1)-O(2) bond length. There is one shorter (3.07 Å) and one longer (3.43 Å) Rb(1)-O(3) bond length. There is one shorter (3.15 Å) and one longer (3.17 Å) Rb(1)-O(4) bond length. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There is one shorter (2.83 Å) and one longer (3.13 Å) Rb(2)-O(1) bond length. There are a spread of Rb(2)-O(3) bond distances ranging from 2.83-3.37 Å. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(2) atoms. The Li(1)-O(1) bond length is 1.91 Å. The Li(1)-O(4) bond length is 2.20 Å. There is one shorter (1.98 Å) and one longer (2.00 Å) Li(1)-O(2) bond length. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ge(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. The Li(2)-O(1) bond length is 2.04 Å. The Li(2)-O(2) bond length is 2.03 Å. There is one shorter (1.96 Å) and one longer (2.02 Å) Li(2)-O(4) bond length. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Li(2)O4 trigonal pyramids and  an edgeedge with one Li(2)O4 trigonal pyramid. The Ge(1)-O(1) bond length is 1.79 Å. The Ge(1)-O(2) bond length is 1.82 Å. The Ge(1)-O(3) bond length is 1.76 Å. The Ge(1)-O(4) bond length is 1.81 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), one Li(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(2), two equivalent Li(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Rb(1), four equivalent Rb(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(1), two equivalent Li(2), and one Ge(1) atom.