NaBSi3O8 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. B(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent B(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Si(2), and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one B(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one Si(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1), one B(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom.
NaBSi3O8 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. The Na(1)-O(2) bond length is 2.44 Å. The Na(1)-O(3) bond length is 2.43 Å. The Na(1)-O(6) bond length is 2.85 Å. The Na(1)-O(7) bond length is 2.41 Å. The Na(1)-O(8) bond length is 2.88 Å. There is one shorter (2.48 Å) and one longer (2.51 Å) Na(1)-O(1) bond length. B(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. The B(1)-O(1) bond length is 1.50 Å. The B(1)-O(3) bond length is 1.48 Å. The B(1)-O(5) bond length is 1.46 Å. The B(1)-O(7) bond length is 1.49 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.62 Å. The Si(1)-O(6) bond length is 1.64 Å. The Si(1)-O(8) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Si(2)-O(2) bond length is 1.66 Å. The Si(2)-O(3) bond length is 1.61 Å. The Si(2)-O(6) bond length is 1.64 Å. The Si(2)-O(8) bond length is 1.63 Å. In the third Si site, Si(3) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent B(1)O4 tetrahedra. The Si(3)-O(2) bond length is 1.67 Å. The Si(3)-O(4) bond length is 1.64 Å. The Si(3)-O(5) bond length is 1.62 Å. The Si(3)-O(7) bond length is 1.63 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Si(2), and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one B(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one Si(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1), one B(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom.