Na2Al2Si3O10 crystallizes in the orthorhombic Fdd2 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. Al(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Al(1), and one Si(1) atom. In the third O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Al(1), and one Si(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom.
Na2Al2Si3O10 crystallizes in the orthorhombic Fdd2 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. The Na(1)-O(1) bond length is 2.53 Å. The Na(1)-O(2) bond length is 2.83 Å. The Na(1)-O(4) bond length is 2.53 Å. The Na(1)-O(5) bond length is 2.41 Å. Al(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. The Al(1)-O(1) bond length is 1.75 Å. The Al(1)-O(3) bond length is 1.74 Å. The Al(1)-O(4) bond length is 1.77 Å. The Al(1)-O(5) bond length is 1.77 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.61 Å. The Si(1)-O(4) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. Both Si(2)-O(2) bond lengths are 1.65 Å. Both Si(2)-O(5) bond lengths are 1.62 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Al(1), and one Si(1) atom. In the third O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Al(1), and one Si(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom.