MgMnZnSiO6 crystallizes in the orthorhombic Cmce space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. Mn(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mg(1)O6 octahedra. Zn(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form ZnO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. Si(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with four equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Mn(1) atom. In the second O site, O(2) is bonded in a see-saw-like geometry to two equivalent Mg(1) and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Zn(1), and one Si(1) atom.
MgMnZnSiO6 crystallizes in the orthorhombic Cmce space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Mg(1)-O(1) bond lengths are 2.02 Å. Both Mg(1)-O(2) bond lengths are 2.12 Å. Both Mg(1)-O(3) bond lengths are 2.08 Å. Mn(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mg(1)O6 octahedra. The Mn(1)-O(1) bond length is 1.78 Å. The Mn(1)-O(3) bond length is 2.15 Å. Both Mn(1)-O(2) bond lengths are 1.96 Å. Both Mn(1)-O(5) bond lengths are 2.08 Å. Zn(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form ZnO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. Both Zn(1)-O(4) bond lengths are 1.95 Å. Both Zn(1)-O(5) bond lengths are 2.01 Å. Si(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with four equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-58°. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.64 Å. Both Si(1)-O(5) bond lengths are 1.67 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Mn(1) atom. In the second O site, O(2) is bonded in a see-saw-like geometry to two equivalent Mg(1) and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Zn(1), and one Si(1) atom.