MgFeSiO4 is Hausmannite-derived structured and crystallizes in the orthorhombic Pnma 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 four equivalent Fe(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-64°. Fe(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form FeO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-64°. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-64°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Fe(1), and one Si(1) atom.
MgFeSiO4 is Hausmannite-derived structured and crystallizes in the orthorhombic Pnma 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 four equivalent Fe(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-64°. Both Mg(1)-O(1) bond lengths are 2.12 Å. Both Mg(1)-O(2) bond lengths are 2.09 Å. Both Mg(1)-O(3) bond lengths are 2.19 Å. Fe(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form FeO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-64°. The Fe(1)-O(1) bond length is 2.28 Å. The Fe(1)-O(2) bond length is 2.15 Å. There are two shorter (2.11 Å) and two longer (2.29 Å) Fe(1)-O(3) bond lengths. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-64°. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.67 Å. Both Si(1)-O(3) bond lengths are 1.66 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Fe(1), and one Si(1) atom.