MgMn6(O2F)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(5), two equivalent O(3), and one F(3) atom. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(5), two equivalent O(3), one F(1), and one F(3) atom to form MnO4F2 octahedra that share corners with three equivalent Mn(4)O4F square pyramids,  an edgeedge with one Mn(2)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent F(2) atoms to form MnO4F2 octahedra that share corners with three equivalent Mn(6)O3F2 trigonal bipyramids,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. In the third Mn site, Mn(3) is bonded to one O(2), one O(6), two equivalent O(4), one F(1), and one F(3) atom to form distorted MnO4F2 octahedra that share corners with three equivalent Mn(4)O4F square pyramids, corners with three equivalent Mn(6)O3F2 trigonal bipyramids,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(2)O4F2 octahedra. In the fourth Mn site, Mn(4) is bonded to two equivalent O(3), two equivalent O(4), and one F(1) atom to form distorted MnO4F square pyramids that share corners with three equivalent Mn(1)O4F2 octahedra, corners with three equivalent Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(6)O3F2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-50°. In the fifth Mn site, Mn(5) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent F(2) atoms. In the sixth Mn site, Mn(6) is bonded to one O(6), two equivalent O(4), and two equivalent F(2) atoms to form distorted MnO3F2 trigonal bipyramids that share corners with three equivalent Mn(2)O4F2 octahedra, corners with three equivalent Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(4)O4F square pyramid. The corner-sharing octahedral tilt angles range from 45-55°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(5) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mn(2) and one Mn(3) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(4), and one Mn(5) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Mn(6) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(6) atom. There are three inequivalent F sites. In the first F site, F(3) is bonded in a T-shaped geometry to one Mg(1), one Mn(1), and one Mn(3) atom. In the second F site, F(1) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(3), and one Mn(4) atom. In the third F site, F(2) is bonded in a trigonal planar geometry to one Mn(2), one Mn(5), and one Mn(6) atom.
MgMn6(O2F)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(5), two equivalent O(3), and one F(3) atom. The Mg(1)-O(5) bond length is 1.91 Å. Both Mg(1)-O(3) bond lengths are 2.00 Å. The Mg(1)-F(3) bond length is 1.96 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(5), two equivalent O(3), one F(1), and one F(3) atom to form MnO4F2 octahedra that share corners with three equivalent Mn(4)O4F square pyramids,  an edgeedge with one Mn(2)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. The Mn(1)-O(1) bond length is 1.87 Å. The Mn(1)-O(5) bond length is 1.88 Å. Both Mn(1)-O(3) bond lengths are 2.03 Å. The Mn(1)-F(1) bond length is 1.97 Å. The Mn(1)-F(3) bond length is 2.15 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent F(2) atoms to form MnO4F2 octahedra that share corners with three equivalent Mn(6)O3F2 trigonal bipyramids,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. The Mn(2)-O(1) bond length is 2.02 Å. The Mn(2)-O(2) bond length is 1.89 Å. The Mn(2)-O(5) bond length is 1.97 Å. The Mn(2)-O(6) bond length is 2.00 Å. Both Mn(2)-F(2) bond lengths are 2.09 Å. In the third Mn site, Mn(3) is bonded to one O(2), one O(6), two equivalent O(4), one F(1), and one F(3) atom to form distorted MnO4F2 octahedra that share corners with three equivalent Mn(4)O4F square pyramids, corners with three equivalent Mn(6)O3F2 trigonal bipyramids,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(2)O4F2 octahedra. The Mn(3)-O(2) bond length is 1.80 Å. The Mn(3)-O(6) bond length is 1.92 Å. Both Mn(3)-O(4) bond lengths are 1.99 Å. The Mn(3)-F(1) bond length is 2.50 Å. The Mn(3)-F(3) bond length is 2.11 Å. In the fourth Mn site, Mn(4) is bonded to two equivalent O(3), two equivalent O(4), and one F(1) atom to form distorted MnO4F square pyramids that share corners with three equivalent Mn(1)O4F2 octahedra, corners with three equivalent Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(6)O3F2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-50°. Both Mn(4)-O(3) bond lengths are 2.04 Å. Both Mn(4)-O(4) bond lengths are 1.95 Å. The Mn(4)-F(1) bond length is 2.18 Å. In the fifth Mn site, Mn(5) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent F(2) atoms. The Mn(5)-O(1) bond length is 1.96 Å. Both Mn(5)-O(3) bond lengths are 2.21 Å. Both Mn(5)-F(2) bond lengths are 2.12 Å. In the sixth Mn site, Mn(6) is bonded to one O(6), two equivalent O(4), and two equivalent F(2) atoms to form distorted MnO3F2 trigonal bipyramids that share corners with three equivalent Mn(2)O4F2 octahedra, corners with three equivalent Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(4)O4F square pyramid. The corner-sharing octahedral tilt angles range from 45-55°. The Mn(6)-O(6) bond length is 2.05 Å. Both Mn(6)-O(4) bond lengths are 1.99 Å. Both Mn(6)-F(2) bond lengths are 2.10 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(5) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mn(2) and one Mn(3) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(4), and one Mn(5) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Mn(6) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(6) atom. There are three inequivalent F sites. In the first F site, F(3) is bonded in a T-shaped geometry to one Mg(1), one Mn(1), and one Mn(3) atom. In the second F site, F(1) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(3), and one Mn(4) atom. In the third F site, F(2) is bonded in a trigonal planar geometry to one Mn(2), one Mn(5), and one Mn(6) atom.