MgMn6O11F crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(11), one O(8), two equivalent O(2), and two equivalent F(1) atoms to form MgO4F2 octahedra that share corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, edges with two equivalent Mg(1)O4F2 octahedra,  a faceface with one Mn(6)O4F2 octahedra, and  a faceface with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-42°. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(11) atoms to form MnO5 square pyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-74°. In the second Mn site, Mn(2) is bonded to one O(1), one O(5), two equivalent O(10), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, and edges with two equivalent Mn(2)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, edges with two equivalent Mn(3)O6 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 34°. In the fourth Mn site, Mn(4) is bonded to one O(9), two equivalent O(5), and two equivalent O(8) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 50-73°. In the fifth Mn site, Mn(5) is bonded to one O(10), two equivalent O(6), and two equivalent O(7) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-52°. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(7), two equivalent O(9), and two equivalent F(1) atoms to form distorted MnO4F2 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, edges with two equivalent Mn(6)O4F2 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 42°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(1) and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(4) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(3) and two equivalent Mn(5) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(6) and two equivalent Mn(5) atoms. In the eighth O site, O(8) is bonded to one Mg(1), one Mn(3), and two equivalent Mn(4) atoms to form distorted corner-sharing OMgMn3 tetrahedra. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mn(4) and two equivalent Mn(6) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(5) and two equivalent Mn(2) atoms. In the eleventh O site, O(11) is bonded to one Mg(1), one Mn(6), and two equivalent Mn(1) atoms to form corner-sharing OMgMn3 tetrahedra. F(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Mn(6) atoms.
MgMn6O11F crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(11), one O(8), two equivalent O(2), and two equivalent F(1) atoms to form MgO4F2 octahedra that share corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, edges with two equivalent Mg(1)O4F2 octahedra,  a faceface with one Mn(6)O4F2 octahedra, and  a faceface with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-42°. The Mg(1)-O(11) bond length is 2.04 Å. The Mg(1)-O(8) bond length is 2.08 Å. Both Mg(1)-O(2) bond lengths are 2.10 Å. Both Mg(1)-F(1) bond lengths are 2.05 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(11) atoms to form MnO5 square pyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-74°. The Mn(1)-O(4) bond length is 2.04 Å. Both Mn(1)-O(1) bond lengths are 1.91 Å. Both Mn(1)-O(11) bond lengths are 2.00 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(5), two equivalent O(10), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, and edges with two equivalent Mn(2)O6 octahedra. The Mn(2)-O(1) bond length is 1.95 Å. The Mn(2)-O(5) bond length is 1.94 Å. Both Mn(2)-O(10) bond lengths are 1.97 Å. Both Mn(2)-O(3) bond lengths are 1.89 Å. In the third Mn site, Mn(3) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, edges with two equivalent Mn(3)O6 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 34°. The Mn(3)-O(6) bond length is 1.92 Å. The Mn(3)-O(8) bond length is 2.05 Å. Both Mn(3)-O(2) bond lengths are 2.03 Å. Both Mn(3)-O(4) bond lengths are 1.91 Å. In the fourth Mn site, Mn(4) is bonded to one O(9), two equivalent O(5), and two equivalent O(8) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 50-73°. The Mn(4)-O(9) bond length is 2.04 Å. Both Mn(4)-O(5) bond lengths are 1.92 Å. Both Mn(4)-O(8) bond lengths are 1.97 Å. In the fifth Mn site, Mn(5) is bonded to one O(10), two equivalent O(6), and two equivalent O(7) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(6)O4F2 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-52°. The Mn(5)-O(10) bond length is 1.98 Å. Both Mn(5)-O(6) bond lengths are 1.94 Å. Both Mn(5)-O(7) bond lengths are 1.96 Å. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(7), two equivalent O(9), and two equivalent F(1) atoms to form distorted MnO4F2 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra, corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mn(4)O5 square pyramids, corners with two equivalent Mn(5)O5 square pyramids, edges with two equivalent Mn(6)O4F2 octahedra, and  a faceface with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 42°. The Mn(6)-O(11) bond length is 2.10 Å. The Mn(6)-O(7) bond length is 1.94 Å. Both Mn(6)-O(9) bond lengths are 1.88 Å. Both Mn(6)-F(1) bond lengths are 2.39 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(1) and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(4) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(3) and two equivalent Mn(5) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(6) and two equivalent Mn(5) atoms. In the eighth O site, O(8) is bonded to one Mg(1), one Mn(3), and two equivalent Mn(4) atoms to form distorted corner-sharing OMgMn3 tetrahedra. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mn(4) and two equivalent Mn(6) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(5) and two equivalent Mn(2) atoms. In the eleventh O site, O(11) is bonded to one Mg(1), one Mn(6), and two equivalent Mn(1) atoms to form corner-sharing OMgMn3 tetrahedra. F(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Mn(6) atoms.