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(1) atoms to form distorted MgO4F2 octahedra that share corners with two equivalent Mn(2)O3F3 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra,  an edgeedge with one Mn(1)O2F2 trigonal pyramid, and faces with two equivalent Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1) and two equivalent F(4) atoms to form distorted MnO2F2 trigonal pyramids that share corners with two equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(2)O3F3 octahedra, and  an edgeedge with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 55-84°. In the second Mn site, Mn(2) is bonded to one O(1), two equivalent O(2), one F(1), one F(3), and one F(4) atom to form MnO3F3 octahedra that share  a cornercorner with one Mg(1)O4F2 octahedra, corners with five equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(1)O2F2 trigonal pyramids,  an edgeedge with one Mn(2)O3F3 octahedra,  an edgeedge with one Mn(3)O3F3 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. 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 six equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(1)O2F2 trigonal pyramids, and edges with two equivalent Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-60°. 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 MnO2F4 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with three equivalent Mn(3)O3F3 octahedra, corners with five equivalent Mn(2)O3F3 octahedra,  a cornercorner with one Mn(1)O2F2 trigonal pyramid, and  an edgeedge with one Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. 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 a mixture of distorted corner and edge-sharing OMgMn3 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(4), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted 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 in a 3-coordinate geometry to one Mg(1), one Mn(2), and one Mn(4) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(4) atoms. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom.
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(1) atoms to form distorted MgO4F2 octahedra that share corners with two equivalent Mn(2)O3F3 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(4)O2F4 octahedra,  an edgeedge with one Mn(1)O2F2 trigonal pyramid, and faces with two equivalent Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. Both Mg(1)-O(1) bond lengths are 2.11 Å. Both Mg(1)-O(2) bond lengths are 2.29 Å. Both Mg(1)-F(1) bond lengths are 2.02 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1) and two equivalent F(4) atoms to form distorted MnO2F2 trigonal pyramids that share corners with two equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with four equivalent Mn(2)O3F3 octahedra, and  an edgeedge with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 55-84°. Both Mn(1)-O(1) bond lengths are 2.09 Å. Both Mn(1)-F(4) bond lengths are 2.02 Å. In the second Mn site, Mn(2) is bonded to one O(1), two equivalent O(2), one F(1), one F(3), and one F(4) atom to form MnO3F3 octahedra that share  a cornercorner with one Mg(1)O4F2 octahedra, corners with five equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(1)O2F2 trigonal pyramids,  an edgeedge with one Mn(2)O3F3 octahedra,  an edgeedge with one Mn(3)O3F3 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. The Mn(2)-O(1) bond length is 2.02 Å. There is one shorter (2.12 Å) and one longer (2.23 Å) Mn(2)-O(2) bond length. The Mn(2)-F(1) bond length is 2.21 Å. The Mn(2)-F(3) bond length is 2.10 Å. The Mn(2)-F(4) bond length is 2.12 Å. 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 six equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(1)O2F2 trigonal pyramids, and edges with two equivalent Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-60°. The Mn(3)-O(3) bond length is 2.14 Å. Both Mn(3)-O(1) bond lengths are 2.24 Å. The Mn(3)-F(2) bond length is 2.32 Å. Both Mn(3)-F(3) bond lengths are 2.15 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 MnO2F4 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with three equivalent Mn(3)O3F3 octahedra, corners with five equivalent Mn(2)O3F3 octahedra,  a cornercorner with one Mn(1)O2F2 trigonal pyramid, and  an edgeedge with one Mn(4)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. The Mn(4)-O(2) bond length is 1.90 Å. The Mn(4)-O(3) bond length is 1.93 Å. The Mn(4)-F(1) bond length is 2.11 Å. The Mn(4)-F(2) bond length is 2.19 Å. The Mn(4)-F(3) bond length is 2.00 Å. The Mn(4)-F(4) bond length is 2.18 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 a mixture of distorted corner and edge-sharing OMgMn3 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(4), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted 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 in a 3-coordinate geometry to one Mg(1), one Mn(2), and one Mn(4) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(4) atoms. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom.