Mg(SiO2)6 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), and two equivalent O(5) atoms to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(6), and two equivalent O(4) atoms to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded in a distorted L-shaped geometry to two equivalent O(1) atoms. In the fourth Si site, Si(4) is bonded to two equivalent O(2) and two equivalent O(6) atoms to form corner-sharing SiO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom.
Mg(SiO2)6 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 2.05 Å. Both Mg(1)-O(3) bond lengths are 1.86 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), and two equivalent O(5) atoms to form corner-sharing SiO4 tetrahedra. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.59 Å. There is one shorter (1.66 Å) and one longer (1.68 Å) Si(1)-O(5) bond length. In the second Si site, Si(2) is bonded to one O(1), one O(6), and two equivalent O(4) atoms to form corner-sharing SiO4 tetrahedra. The Si(2)-O(1) bond length is 1.67 Å. The Si(2)-O(6) bond length is 1.62 Å. There is one shorter (1.63 Å) and one longer (1.64 Å) Si(2)-O(4) bond length. In the third Si site, Si(3) is bonded in a distorted L-shaped geometry to two equivalent O(1) atoms. Both Si(3)-O(1) bond lengths are 1.71 Å. In the fourth Si site, Si(4) is bonded to two equivalent O(2) and two equivalent O(6) atoms to form corner-sharing SiO4 tetrahedra. Both Si(4)-O(2) bond lengths are 1.61 Å. Both Si(4)-O(6) bond lengths are 1.66 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom.