MgMn6O5F7 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(4) atoms to form distorted MgO4F2 octahedra that share corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra, and edges with two equivalent Mn(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 29-61°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(1) atoms to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra, and edges with two equivalent Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 34-56°. In the second Mn site, Mn(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one F(3), two equivalent F(1), and two equivalent F(4) atoms. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(1), one F(2), and two equivalent F(3) atoms to form MnO3F3 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O4F2 octahedra, and corners with six equivalent Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 45-57°. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(3), one F(1), one F(2), one F(3), and one F(4) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O4F2 octahedra, corners with three equivalent Mn(3)O3F3 octahedra, and  an edgeedge with one Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 29-61°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Mn(1), one Mn(2), and one Mn(3) atom to form OMgMn3 tetrahedra that share  a cornercorner with one O(1)MgMn3 tetrahedra, corners with two equivalent F(1)Mn4 trigonal pyramids, corners with five equivalent O(2)MgMn3 trigonal pyramids,  an edgeedge with one O(1)MgMn3 tetrahedra, and  an edgeedge with one F(1)Mn4 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one Mn(1), one Mn(2), and one Mn(4) atom to form OMgMn3 trigonal pyramids that share corners with five equivalent O(1)MgMn3 tetrahedra,  a cornercorner with one F(1)Mn4 trigonal pyramid,  an edgeedge with one O(2)MgMn3 trigonal pyramid, and edges with two equivalent F(1)Mn4 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(3) and two equivalent Mn(4) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded to one Mn(1), one Mn(4), and two equivalent Mn(2) atoms to form distorted FMn4 trigonal pyramids that share corners with two equivalent O(1)MgMn3 tetrahedra,  a cornercorner with one O(2)MgMn3 trigonal pyramid, corners with three equivalent F(1)Mn4 trigonal pyramids,  an edgeedge with one O(1)MgMn3 tetrahedra, and edges with two equivalent O(2)MgMn3 trigonal pyramids. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Mn(3) and two equivalent Mn(4) atoms. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(4), and two equivalent Mn(2) atoms.
MgMn6O5F7 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(4) atoms to form distorted MgO4F2 octahedra that share corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra, and edges with two equivalent Mn(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 29-61°. Both Mg(1)-O(1) bond lengths are 2.19 Å. Both Mg(1)-O(2) bond lengths are 2.24 Å. Both Mg(1)-F(4) bond lengths are 2.01 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(1) atoms to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra, and edges with two equivalent Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 34-56°. Both Mn(1)-O(1) bond lengths are 2.02 Å. Both Mn(1)-O(2) bond lengths are 1.98 Å. Both Mn(1)-F(1) bond lengths are 2.37 Å. In the second Mn site, Mn(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one F(3), two equivalent F(1), and two equivalent F(4) atoms. The Mn(2)-O(1) bond length is 2.06 Å. The Mn(2)-O(2) bond length is 2.11 Å. The Mn(2)-F(3) bond length is 2.18 Å. There is one shorter (2.13 Å) and one longer (2.38 Å) Mn(2)-F(1) bond length. There is one shorter (2.13 Å) and one longer (2.45 Å) Mn(2)-F(4) bond length. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(1), one F(2), and two equivalent F(3) atoms to form MnO3F3 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O4F2 octahedra, and corners with six equivalent Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 45-57°. The Mn(3)-O(3) bond length is 1.90 Å. Both Mn(3)-O(1) bond lengths are 2.05 Å. The Mn(3)-F(2) bond length is 2.00 Å. Both Mn(3)-F(3) bond lengths are 2.33 Å. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(3), one F(1), one F(2), one F(3), and one F(4) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O4F2 octahedra, corners with three equivalent Mn(3)O3F3 octahedra, and  an edgeedge with one Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 29-61°. The Mn(4)-O(2) bond length is 1.98 Å. The Mn(4)-O(3) bond length is 2.00 Å. The Mn(4)-F(1) bond length is 2.15 Å. The Mn(4)-F(2) bond length is 2.29 Å. The Mn(4)-F(3) bond length is 2.04 Å. The Mn(4)-F(4) bond length is 2.37 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Mn(1), one Mn(2), and one Mn(3) atom to form OMgMn3 tetrahedra that share  a cornercorner with one O(1)MgMn3 tetrahedra, corners with two equivalent F(1)Mn4 trigonal pyramids, corners with five equivalent O(2)MgMn3 trigonal pyramids,  an edgeedge with one O(1)MgMn3 tetrahedra, and  an edgeedge with one F(1)Mn4 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one Mn(1), one Mn(2), and one Mn(4) atom to form OMgMn3 trigonal pyramids that share corners with five equivalent O(1)MgMn3 tetrahedra,  a cornercorner with one F(1)Mn4 trigonal pyramid,  an edgeedge with one O(2)MgMn3 trigonal pyramid, and edges with two equivalent F(1)Mn4 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(3) and two equivalent Mn(4) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded to one Mn(1), one Mn(4), and two equivalent Mn(2) atoms to form distorted FMn4 trigonal pyramids that share corners with two equivalent O(1)MgMn3 tetrahedra,  a cornercorner with one O(2)MgMn3 trigonal pyramid, corners with three equivalent F(1)Mn4 trigonal pyramids,  an edgeedge with one O(1)MgMn3 tetrahedra, and edges with two equivalent O(2)MgMn3 trigonal pyramids. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Mn(3) and two equivalent Mn(4) atoms. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(4), and two equivalent Mn(2) atoms.