Mg2Y3Si3O13 crystallizes in the hexagonal P6_3/m space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(3) atoms. Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1), one Y(1), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. In the third O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OYMg2Si tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Si(1) atom.
Mg2Y3Si3O13 crystallizes in the hexagonal P6_3/m space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(3) atoms. All Mg(1)-O(1) bond lengths are 2.42 Å. All Mg(1)-O(3) bond lengths are 2.18 Å. Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), and four equivalent O(2) atoms. The Y(1)-O(1) bond length is 2.36 Å. The Y(1)-O(3) bond length is 2.88 Å. The Y(1)-O(4) bond length is 2.30 Å. There are two shorter (2.22 Å) and two longer (2.37 Å) Y(1)-O(2) bond lengths. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.63 Å. Both Si(1)-O(2) bond lengths are 1.65 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1), one Y(1), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. In the third O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OYMg2Si tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Si(1) atom.