Mg(SnO2)2 is Spinel-like structured and crystallizes in the trigonal R3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(3) and three equivalent O(4) atoms to form MgO4 tetrahedra that share corners with three equivalent Mg(2)O6 octahedra and corners with nine equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the second Mg site, Mg(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form MgO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Sn(1)O4 tetrahedra, and edges with six equivalent Sn(2)O6 octahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2) and three equivalent O(1) atoms to form SnO4 tetrahedra that share corners with three equivalent Mg(2)O6 octahedra and corners with nine equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. In the second Sn site, Sn(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Sn(1)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and edges with four equivalent Sn(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Mg(2), one Sn(1), and two equivalent Sn(2) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(2)Sn4 tetrahedra, corners with two equivalent O(1)MgSn3 tetrahedra,  an edgeedge with one O(2)Sn4 tetrahedra, and edges with two equivalent O(1)MgSn3 tetrahedra. In the second O site, O(2) is bonded to one Sn(1) and three equivalent Sn(2) atoms to form a mixture of corner and edge-sharing OSn4 tetrahedra. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Sn(2) atoms. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Sn(2) atoms.
Mg(SnO2)2 is Spinel-like structured and crystallizes in the trigonal R3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(3) and three equivalent O(4) atoms to form MgO4 tetrahedra that share corners with three equivalent Mg(2)O6 octahedra and corners with nine equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. The Mg(1)-O(3) bond length is 2.11 Å. All Mg(1)-O(4) bond lengths are 2.15 Å. In the second Mg site, Mg(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form MgO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Sn(1)O4 tetrahedra, and edges with six equivalent Sn(2)O6 octahedra. All Mg(2)-O(1) bond lengths are 2.15 Å. All Mg(2)-O(4) bond lengths are 2.25 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2) and three equivalent O(1) atoms to form SnO4 tetrahedra that share corners with three equivalent Mg(2)O6 octahedra and corners with nine equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. The Sn(1)-O(2) bond length is 2.34 Å. All Sn(1)-O(1) bond lengths are 2.33 Å. In the second Sn site, Sn(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Sn(1)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and edges with four equivalent Sn(2)O6 octahedra. The Sn(2)-O(2) bond length is 2.20 Å. The Sn(2)-O(3) bond length is 2.27 Å. Both Sn(2)-O(1) bond lengths are 2.16 Å. Both Sn(2)-O(4) bond lengths are 2.24 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Mg(2), one Sn(1), and two equivalent Sn(2) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(2)Sn4 tetrahedra, corners with two equivalent O(1)MgSn3 tetrahedra,  an edgeedge with one O(2)Sn4 tetrahedra, and edges with two equivalent O(1)MgSn3 tetrahedra. In the second O site, O(2) is bonded to one Sn(1) and three equivalent Sn(2) atoms to form a mixture of corner and edge-sharing OSn4 tetrahedra. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Sn(2) atoms. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Sn(2) atoms.