Na2GeO10 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one O(9) atom. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one O(1) atom. In the second O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one O(5) atom. In the third O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Na(2) and one O(8) atom. In the fourth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Ge(1), and one O(6) atom. In the fifth O site, O(9) is bonded in a T-shaped geometry to one Na(1), one Na(2), and one O(5) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Ge(1) atom. In the seventh O site, O(10) is bonded in a 3-coordinate geometry to one Na(1), one O(3), and one O(4) atom. In the eighth O site, O(3) is bonded in a distorted single-bond geometry to one Ge(1) and one O(10) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Ge(1) and one O(10) atom. In the tenth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one O(7), and one O(9) atom.
Na2GeO10 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(7), and one O(9) atom. The Na(1)-O(10) bond length is 2.97 Å. The Na(1)-O(2) bond length is 2.55 Å. The Na(1)-O(5) bond length is 2.70 Å. The Na(1)-O(6) bond length is 2.51 Å. The Na(1)-O(7) bond length is 2.35 Å. The Na(1)-O(9) bond length is 2.33 Å. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one O(9) atom. The Na(2)-O(1) bond length is 2.73 Å. The Na(2)-O(2) bond length is 2.22 Å. The Na(2)-O(7) bond length is 2.37 Å. The Na(2)-O(8) bond length is 2.69 Å. The Na(2)-O(9) bond length is 2.43 Å. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Ge(1)-O(1) bond length is 1.92 Å. The Ge(1)-O(2) bond length is 1.68 Å. The Ge(1)-O(3) bond length is 1.83 Å. The Ge(1)-O(4) bond length is 1.90 Å. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one O(1) atom. The O(6)-O(1) bond length is 1.34 Å. In the second O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one O(5) atom. The O(7)-O(5) bond length is 1.34 Å. In the third O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Na(2) and one O(8) atom. The O(8)-O(8) bond length is 1.25 Å. In the fourth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Ge(1), and one O(6) atom. In the fifth O site, O(9) is bonded in a T-shaped geometry to one Na(1), one Na(2), and one O(5) atom. The O(9)-O(5) bond length is 1.38 Å. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Ge(1) atom. In the seventh O site, O(10) is bonded in a 3-coordinate geometry to one Na(1), one O(3), and one O(4) atom. The O(10)-O(3) bond length is 1.51 Å. The O(10)-O(4) bond length is 1.42 Å. In the eighth O site, O(3) is bonded in a distorted single-bond geometry to one Ge(1) and one O(10) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Ge(1) and one O(10) atom. In the tenth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one O(7), and one O(9) atom.