Mg4FeO5 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third Mg site, Mg(3) is bonded to one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with three equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Mg site, Mg(4) is bonded to one O(5), one O(6), two equivalent O(4), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth Mg site, Mg(5) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the sixth Mg site, Mg(6) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), and four equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Mg(1)O6 octahedra, and edges with four equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Fe site, Fe(2) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with four equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third Fe site, Fe(3) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with four equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(2)Mg4Fe2 octahedra, corners with four equivalent O(6)Mg6 octahedra, edges with two equivalent O(2)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with eight equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(1)Mg4Fe2 octahedra, corners with four equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)Mg4Fe2 octahedra, edges with two equivalent O(6)Mg6 octahedra, and edges with eight equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(3) is bonded to four equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(3)Mg4Fe2 octahedra, corners with four equivalent O(4)Mg6 octahedra, edges with two equivalent O(3)Mg4Fe2 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with four equivalent O(7)Mg4Fe2 octahedra, and edges with four equivalent O(8)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(4) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(3)Mg4Fe2 octahedra, corners with two equivalent O(9)Mg4Fe2 octahedra, corners with two equivalent O(4)Mg6 octahedra,  an edgeedge with one O(3)Mg4Fe2 octahedra,  an edgeedge with one O(9)Mg4Fe2 octahedra, edges with two equivalent O(7)Mg4Fe2 octahedra, edges with two equivalent O(8)Mg4Fe2 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(2), one Mg(5), one Mg(6), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(2)Mg4Fe2 octahedra, corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(1)Mg4Fe2 octahedra,  an edgeedge with one O(8)Mg4Fe2 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with four equivalent O(9)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the sixth O site, O(6) is bonded to one Mg(1), one Mg(2), one Mg(5), one Mg(6), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(1)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(2)Mg4Fe2 octahedra,  an edgeedge with one O(7)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(9)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the seventh O site, O(7) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(6)Mg6 octahedra, edges with three equivalent O(8)Mg4Fe2 octahedra, edges with four equivalent O(3)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(5)Mg6 octahedra, edges with three equivalent O(7)Mg4Fe2 octahedra, edges with four equivalent O(3)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the ninth O site, O(9) is bonded to one Mg(1), one Mg(2), two equivalent Mg(4), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(9)Mg4Fe2 octahedra,  an edgeedge with one O(4)Mg6 octahedra, edges with two equivalent O(1)Mg4Fe2 octahedra, edges with two equivalent O(2)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(6)Mg6 octahedra, and edges with three equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°.
Mg4FeO5 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Mg(1)-O(1) bond length is 2.17 Å. The Mg(1)-O(2) bond length is 2.17 Å. The Mg(1)-O(5) bond length is 2.12 Å. The Mg(1)-O(6) bond length is 2.12 Å. Both Mg(1)-O(9) bond lengths are 2.13 Å. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Mg(2)-O(1) bond length is 2.17 Å. The Mg(2)-O(2) bond length is 2.17 Å. The Mg(2)-O(5) bond length is 2.12 Å. The Mg(2)-O(6) bond length is 2.12 Å. Both Mg(2)-O(9) bond lengths are 2.13 Å. In the third Mg site, Mg(3) is bonded to one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with three equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Mg(3)-O(7) bond length is 2.13 Å. The Mg(3)-O(8) bond length is 2.13 Å. Both Mg(3)-O(3) bond lengths are 2.16 Å. Both Mg(3)-O(4) bond lengths are 2.13 Å. In the fourth Mg site, Mg(4) is bonded to one O(5), one O(6), two equivalent O(4), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Mg(4)-O(5) bond length is 2.13 Å. The Mg(4)-O(6) bond length is 2.13 Å. Both Mg(4)-O(4) bond lengths are 2.14 Å. Both Mg(4)-O(9) bond lengths are 2.10 Å. In the fifth Mg site, Mg(5) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-3°. The Mg(5)-O(5) bond length is 2.15 Å. The Mg(5)-O(6) bond length is 2.14 Å. The Mg(5)-O(7) bond length is 2.12 Å. The Mg(5)-O(8) bond length is 2.12 Å. Both Mg(5)-O(4) bond lengths are 2.12 Å. In the sixth Mg site, Mg(6) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Mg(6)-O(5) bond length is 2.13 Å. The Mg(6)-O(6) bond length is 2.13 Å. The Mg(6)-O(7) bond length is 2.10 Å. The Mg(6)-O(8) bond length is 2.09 Å. Both Mg(6)-O(4) bond lengths are 2.14 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), and four equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Mg(1)O6 octahedra, and edges with four equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Fe(1)-O(1) bond length is 2.13 Å. The Fe(1)-O(2) bond length is 2.13 Å. All Fe(1)-O(9) bond lengths are 2.20 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with four equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Both Fe(2)-O(3) bond lengths are 2.08 Å. Both Fe(2)-O(7) bond lengths are 2.21 Å. Both Fe(2)-O(8) bond lengths are 2.21 Å. In the third Fe site, Fe(3) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with four equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Fe(3)-O(3) bond lengths are 2.18 Å. Both Fe(3)-O(7) bond lengths are 2.17 Å. Both Fe(3)-O(8) bond lengths are 2.18 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(2)Mg4Fe2 octahedra, corners with four equivalent O(6)Mg6 octahedra, edges with two equivalent O(2)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with eight equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(1)Mg4Fe2 octahedra, corners with four equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)Mg4Fe2 octahedra, edges with two equivalent O(6)Mg6 octahedra, and edges with eight equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(3) is bonded to four equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(3)Mg4Fe2 octahedra, corners with four equivalent O(4)Mg6 octahedra, edges with two equivalent O(3)Mg4Fe2 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with four equivalent O(7)Mg4Fe2 octahedra, and edges with four equivalent O(8)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(4) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(3)Mg4Fe2 octahedra, corners with two equivalent O(9)Mg4Fe2 octahedra, corners with two equivalent O(4)Mg6 octahedra,  an edgeedge with one O(3)Mg4Fe2 octahedra,  an edgeedge with one O(9)Mg4Fe2 octahedra, edges with two equivalent O(7)Mg4Fe2 octahedra, edges with two equivalent O(8)Mg4Fe2 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(2), one Mg(5), one Mg(6), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(2)Mg4Fe2 octahedra, corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(1)Mg4Fe2 octahedra,  an edgeedge with one O(8)Mg4Fe2 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with four equivalent O(9)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the sixth O site, O(6) is bonded to one Mg(1), one Mg(2), one Mg(5), one Mg(6), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(1)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(2)Mg4Fe2 octahedra,  an edgeedge with one O(7)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(9)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the seventh O site, O(7) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(6)Mg6 octahedra, edges with three equivalent O(8)Mg4Fe2 octahedra, edges with four equivalent O(3)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(6), two equivalent Mg(3), one Fe(2), and one Fe(3) atom to form OMg4Fe2 octahedra that share corners with two equivalent O(7)Mg4Fe2 octahedra, corners with two equivalent O(8)Mg4Fe2 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(5)Mg6 octahedra, edges with three equivalent O(7)Mg4Fe2 octahedra, edges with four equivalent O(3)Mg4Fe2 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the ninth O site, O(9) is bonded to one Mg(1), one Mg(2), two equivalent Mg(4), and two equivalent Fe(1) atoms to form OMg4Fe2 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(9)Mg4Fe2 octahedra,  an edgeedge with one O(4)Mg6 octahedra, edges with two equivalent O(1)Mg4Fe2 octahedra, edges with two equivalent O(2)Mg4Fe2 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(6)Mg6 octahedra, and edges with three equivalent O(9)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°.