Na2Be3Si3O8 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one Be(2), one O(1), one O(4), one O(6), and one O(7) atom. In the second Na site, Na(2) is bonded in a 1-coordinate geometry to one Be(2) and one O(5) atom. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded in a single-bond geometry to two equivalent Be(2) and one O(3) atom. In the second Be site, Be(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Be(2), and two equivalent Be(1) atoms. In the third Be site, Be(3) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share corners with two equivalent Si(1)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(3), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Be(3), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(3) and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), one Be(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2), one Be(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Si(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Si(1) and one Si(2) atom.
Na2Be3Si3O8 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one Be(2), one O(1), one O(4), one O(6), and one O(7) atom. The Na(1)-Be(2) bond length is 2.90 Å. The Na(1)-O(1) bond length is 2.61 Å. The Na(1)-O(4) bond length is 2.51 Å. The Na(1)-O(6) bond length is 2.64 Å. The Na(1)-O(7) bond length is 2.74 Å. In the second Na site, Na(2) is bonded in a 1-coordinate geometry to one Be(2) and one O(5) atom. The Na(2)-Be(2) bond length is 2.98 Å. The Na(2)-O(5) bond length is 2.37 Å. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded in a single-bond geometry to two equivalent Be(2) and one O(3) atom. There is one shorter (2.09 Å) and one longer (2.13 Å) Be(1)-Be(2) bond length. The Be(1)-O(3) bond length is 1.52 Å. In the second Be site, Be(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Be(2), and two equivalent Be(1) atoms. The Be(2)-Be(2) bond length is 1.95 Å. In the third Be site, Be(3) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. The Be(3)-O(1) bond length is 1.63 Å. The Be(3)-O(2) bond length is 1.56 Å. The Be(3)-O(3) bond length is 1.81 Å. The Be(3)-O(5) bond length is 1.64 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(5) bond length is 1.59 Å. The Si(1)-O(7) bond length is 1.66 Å. The Si(1)-O(8) bond length is 1.66 Å. In the second Si site, Si(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(4) bond length is 1.63 Å. The Si(2)-O(6) bond length is 1.64 Å. The Si(2)-O(7) 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(1), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. The Si(3)-O(1) bond length is 1.62 Å. The Si(3)-O(2) bond length is 1.60 Å. The Si(3)-O(4) bond length is 1.68 Å. The Si(3)-O(6) bond length is 1.70 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Be(3), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(3) and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), one Be(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2), one Be(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Si(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Si(1) and one Si(2) atom.