Na5(SiO3)6 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(3), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(3)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(4), two equivalent O(3), two equivalent O(7), and two equivalent O(9) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Na(1)O8 hexagonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  an edgeedge with one Na(1)O8 hexagonal bipyramid. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(3), and one Si(3) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to two equivalent Na(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Na(1), two equivalent Na(3), and one Si(2) atom.
Na5(SiO3)6 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(3), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(3)O4 tetrahedra. Both Na(1)-O(3) bond lengths are 2.81 Å. Both Na(1)-O(5) bond lengths are 2.60 Å. Both Na(1)-O(7) bond lengths are 2.89 Å. Both Na(1)-O(9) bond lengths are 2.42 Å. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. The Na(2)-O(1) bond length is 2.68 Å. The Na(2)-O(5) bond length is 2.64 Å. There is one shorter (2.25 Å) and one longer (2.85 Å) Na(2)-O(2) bond length. There is one shorter (2.26 Å) and one longer (2.83 Å) Na(2)-O(6) bond length. Both Na(2)-O(8) bond lengths are 2.89 Å. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(4), two equivalent O(3), two equivalent O(7), and two equivalent O(9) atoms. The Na(3)-O(1) bond length is 2.62 Å. The Na(3)-O(4) bond length is 2.63 Å. There is one shorter (2.30 Å) and one longer (2.85 Å) Na(3)-O(3) bond length. There is one shorter (2.27 Å) and one longer (2.82 Å) Na(3)-O(7) bond length. There is one shorter (2.96 Å) and one longer (3.07 Å) Na(3)-O(9) bond length. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Na(1)O8 hexagonal bipyramid. The Si(1)-O(2) bond length is 1.61 Å. The Si(1)-O(3) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.65 Å. The Si(1)-O(5) bond length is 1.66 Å. In the second Si site, Si(2) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The Si(2)-O(1) bond length is 1.67 Å. The Si(2)-O(4) bond length is 1.65 Å. The Si(2)-O(6) bond length is 1.62 Å. The Si(2)-O(9) bond length is 1.62 Å. In the third Si site, Si(3) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  an edgeedge with one Na(1)O8 hexagonal bipyramid. The Si(3)-O(1) bond length is 1.67 Å. The Si(3)-O(5) bond length is 1.67 Å. The Si(3)-O(7) bond length is 1.61 Å. The Si(3)-O(8) bond length is 1.62 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(3), and one Si(3) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to two equivalent Na(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Na(1), two equivalent Na(3), and one Si(2) atom.