Rb2Na2Al3(GeO4)3 is Chalcostibite-derived structured and crystallizes in the orthorhombic Pmn2_1 space group. Rb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(7), and two equivalent O(4) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(5) atoms to form distorted NaO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Ge(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra, corners with four equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Al(1)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(7) atoms to form distorted NaO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Al(2)O4 tetrahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form AlO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid,  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Na(1)O5 square pyramid. In the second Al site, Al(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid, corners with two equivalent Na(2)O5 square pyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and corners with three equivalent Ge(2)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(6), and two equivalent O(7) atoms to form GeO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid,  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra, and  an edgeedge with one Na(2)O5 square pyramid. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Na(1)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with three equivalent Al(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Al(2), and one Ge(2) atom. In the second O site, O(6) is bonded in a trigonal planar geometry to one Na(1), one Al(1), and one Ge(1) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Na(2), one Al(2), and one Ge(1) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Al(1), and one Ge(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Na(2), one Al(2), and one Ge(2) atom. In the sixth O site, O(3) is bonded in a trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom. In the seventh O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(2), and one Ge(2) atom.
Rb2Na2Al3(GeO4)3 is Chalcostibite-derived structured and crystallizes in the orthorhombic Pmn2_1 space group. Rb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(7), and two equivalent O(4) atoms. The Rb(1)-O(1) bond length is 3.38 Å. The Rb(1)-O(2) bond length is 3.24 Å. The Rb(1)-O(5) bond length is 3.39 Å. The Rb(1)-O(7) bond length is 3.17 Å. There is one shorter (2.89 Å) and one longer (3.19 Å) Rb(1)-O(4) bond length. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(5) atoms to form distorted NaO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Ge(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra, corners with four equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Al(1)O4 tetrahedra. The Na(1)-O(6) bond length is 2.39 Å. Both Na(1)-O(1) bond lengths are 2.55 Å. Both Na(1)-O(5) bond lengths are 2.38 Å. In the second Na site, Na(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(7) atoms to form distorted NaO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Al(2)O4 tetrahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The Na(2)-O(3) bond length is 2.39 Å. Both Na(2)-O(2) bond lengths are 2.37 Å. Both Na(2)-O(7) bond lengths are 2.56 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form AlO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid,  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Na(1)O5 square pyramid. The Al(1)-O(3) bond length is 1.78 Å. The Al(1)-O(6) bond length is 1.78 Å. Both Al(1)-O(1) bond lengths are 1.79 Å. In the second Al site, Al(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid, corners with two equivalent Na(2)O5 square pyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and corners with three equivalent Ge(2)O4 tetrahedra. The Al(2)-O(2) bond length is 1.79 Å. The Al(2)-O(4) bond length is 1.77 Å. The Al(2)-O(5) bond length is 1.79 Å. The Al(2)-O(7) bond length is 1.78 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(6), and two equivalent O(7) atoms to form GeO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid,  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra, and  an edgeedge with one Na(2)O5 square pyramid. The Ge(1)-O(3) bond length is 1.79 Å. The Ge(1)-O(6) bond length is 1.78 Å. Both Ge(1)-O(7) bond lengths are 1.79 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Na(1)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with three equivalent Al(2)O4 tetrahedra. The Ge(2)-O(1) bond length is 1.78 Å. The Ge(2)-O(2) bond length is 1.81 Å. The Ge(2)-O(4) bond length is 1.78 Å. The Ge(2)-O(5) bond length is 1.80 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Al(2), and one Ge(2) atom. In the second O site, O(6) is bonded in a trigonal planar geometry to one Na(1), one Al(1), and one Ge(1) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Na(2), one Al(2), and one Ge(1) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Al(1), and one Ge(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Na(2), one Al(2), and one Ge(2) atom. In the sixth O site, O(3) is bonded in a trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom. In the seventh O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(2), and one Ge(2) atom.