Na2LaSiO5 crystallizes in the orthorhombic Pnma space group. Na(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. La(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(4), and four equivalent O(1) atoms. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted see-saw-like geometry to four equivalent Na(1) and two equivalent La(1) atoms. In the second O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent La(1), and one Si(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to four equivalent Na(1), one La(1), and one Si(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to four equivalent Na(1), one La(1), and one Si(1) atom.
Na2LaSiO5 crystallizes in the orthorhombic Pnma space group. Na(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 (2.56 Å) and one longer (2.66 Å) Na(1)-O(1) bond length. There is one shorter (2.53 Å) and one longer (2.72 Å) Na(1)-O(2) bond length. There is one shorter (2.41 Å) and one longer (2.91 Å) Na(1)-O(3) bond length. There is one shorter (2.45 Å) and one longer (3.03 Å) Na(1)-O(4) bond length. La(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(4), and four equivalent O(1) atoms. The La(1)-O(2) bond length is 2.49 Å. The La(1)-O(3) bond length is 2.45 Å. There is one shorter (2.55 Å) and one longer (2.60 Å) La(1)-O(4) bond length. There are two shorter (2.49 Å) and two longer (2.61 Å) La(1)-O(1) bond lengths. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.64 Å. Both Si(1)-O(1) bond lengths are 1.66 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted see-saw-like geometry to four equivalent Na(1) and two equivalent La(1) atoms. In the second O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent La(1), and one Si(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to four equivalent Na(1), one La(1), and one Si(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to four equivalent Na(1), one La(1), and one Si(1) atom.