Na4MgTi2(SiO5)2 crystallizes in the tetragonal P-4m2 space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. Ti(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to four equivalent O(3) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent Na(1) and one Ti(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), one Mg(1), one Ti(1), and one Si(2) atom. In the third O site, O(3) is bonded to two equivalent Na(1), one Ti(1), and one Si(1) atom to form distorted corner-sharing ONa2TiSi tetrahedra.
Na4MgTi2(SiO5)2 crystallizes in the tetragonal P-4m2 space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Na(1)-O(1) bond lengths are 2.65 Å. Both Na(1)-O(2) bond lengths are 2.53 Å. Both Na(1)-O(3) bond lengths are 2.21 Å. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. All Mg(1)-O(2) bond lengths are 1.98 Å. Ti(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. The Ti(1)-O(1) bond length is 1.77 Å. Both Ti(1)-O(2) bond lengths are 2.26 Å. Both Ti(1)-O(3) bond lengths are 2.13 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to four equivalent O(3) atoms. All Si(1)-O(3) bond lengths are 1.65 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All Si(2)-O(2) bond lengths are 1.66 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent Na(1) and one Ti(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), one Mg(1), one Ti(1), and one Si(2) atom. In the third O site, O(3) is bonded to two equivalent Na(1), one Ti(1), and one Si(1) atom to form distorted corner-sharing ONa2TiSi tetrahedra.