Na4Al3Ge3O13 crystallizes in the trigonal R3c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted NaO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with three equivalent Al(1)O4 tetrahedra, and corners with three equivalent Ge(1)O4 tetrahedra. Al(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AlO4 tetrahedra that share corners with three equivalent Na(2)O4 tetrahedra and corners with four equivalent Ge(1)O4 tetrahedra. 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 three equivalent Na(2)O4 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. There are five inequivalent O sites. In the first 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 second O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom. In the third O site, O(5) is bonded in a trigonal planar geometry to three equivalent Na(2) atoms. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Al(1), and one Ge(1) atom. In the fifth O site, O(2) is bonded in a trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom.
Na4Al3Ge3O13 crystallizes in the trigonal R3c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. All Na(1)-O(1) bond lengths are 2.27 Å. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted NaO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with three equivalent Al(1)O4 tetrahedra, and corners with three equivalent Ge(1)O4 tetrahedra. The Na(2)-O(2) bond length is 2.36 Å. The Na(2)-O(3) bond length is 2.36 Å. The Na(2)-O(4) bond length is 2.48 Å. The Na(2)-O(5) bond length is 2.36 Å. Al(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AlO4 tetrahedra that share corners with three equivalent Na(2)O4 tetrahedra and corners with four equivalent Ge(1)O4 tetrahedra. The Al(1)-O(1) bond length is 1.77 Å. The Al(1)-O(2) bond length is 1.77 Å. The Al(1)-O(3) bond length is 1.77 Å. The Al(1)-O(4) bond length is 1.77 Å. 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 three equivalent Na(2)O4 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. The Ge(1)-O(1) bond length is 1.77 Å. The Ge(1)-O(2) bond length is 1.76 Å. The Ge(1)-O(3) bond length is 1.76 Å. The Ge(1)-O(4) bond length is 1.77 Å. There are five inequivalent O sites. In the first 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 second O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom. In the third O site, O(5) is bonded in a trigonal planar geometry to three equivalent Na(2) atoms. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Al(1), and one Ge(1) atom. In the fifth O site, O(2) is bonded in a trigonal planar geometry to one Na(2), one Al(1), and one Ge(1) atom.