Na10Be4Si4O17 crystallizes in the cubic P-43m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the third Na site, Na(3) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. Be(1) is bonded to one O(3) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(2) and three equivalent O(1) atoms to form SiO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(3) is bonded in a tetrahedral geometry to four equivalent Be(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), two equivalent Na(2), one Be(1), and one Si(1) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Na(1) and one Si(1) atom.
Na10Be4Si4O17 crystallizes in the cubic P-43m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. All Na(1)-O(1) bond lengths are 2.64 Å. All Na(1)-O(2) bond lengths are 2.30 Å. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Na(2)-O(1) bond lengths are 2.60 Å. In the third Na site, Na(3) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. All Na(3)-O(1) bond lengths are 2.49 Å. Be(1) is bonded to one O(3) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. The Be(1)-O(3) bond length is 1.69 Å. All Be(1)-O(1) bond lengths are 1.65 Å. Si(1) is bonded to one O(2) and three equivalent O(1) atoms to form SiO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra. The Si(1)-O(2) bond length is 1.61 Å. All Si(1)-O(1) bond lengths are 1.67 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a tetrahedral geometry to four equivalent Be(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), two equivalent Na(2), one Be(1), and one Si(1) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Na(1) and one Si(1) atom.