MgMn12O17F7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(15), one O(17), one O(2), one O(7), and one F(3) atom to form MgO5F octahedra that share corners with two equivalent Mn(11)O5F octahedra, corners with two equivalent Mn(12)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra,  an edgeedge with one Mn(4)O4F2 octahedra, edges with two equivalent Mn(5)O4F2 octahedra, and faces with two equivalent Mn(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 40-51°. There are twelve inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(14), one O(5), one O(7), one F(3), and one F(4) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(8)O5F octahedra, corners with two equivalent Mn(9)O5F octahedra, corners with four equivalent Mn(11)O5F octahedra,  an edgeedge with one Mg(1)O5F octahedra,  an edgeedge with one Mn(2)O4F2 octahedra, and  an edgeedge with one Mn(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 44-66°. In the second Mn site, Mn(2) is bonded to one O(1), one O(13), one O(4), one O(9), one F(2), and one F(4) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(10)O4F2 octahedra, corners with two equivalent Mn(11)O5F octahedra, corners with four equivalent Mn(9)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. In the third Mn site, Mn(3) is bonded to one O(12), one O(3), one O(4), one O(8), one F(2), and one F(5) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(7)O4F2 octahedra, corners with two equivalent Mn(9)O5F octahedra, corners with four equivalent Mn(10)O4F2 octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, and  an edgeedge with one Mn(2)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 42-58°. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(17), one O(2), one O(6), one F(6), and one F(7) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(7)O4F2 octahedra, corners with two equivalent Mn(8)O5F octahedra, corners with four equivalent Mn(12)O5F octahedra,  an edgeedge with one Mg(1)O5F octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, and  an edgeedge with one Mn(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 45-64°. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(15), one O(2), one O(5), one F(3), and one F(7) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(11)O5F octahedra, corners with two equivalent Mn(12)O5F octahedra, corners with four equivalent Mn(8)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra,  an edgeedge with one Mn(4)O4F2 octahedra, and edges with two equivalent Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 43-59°. In the sixth Mn site, Mn(6) is bonded to one O(16), one O(3), one O(6), one F(1), one F(5), and one F(6) atom to form MnO3F3 octahedra that share corners with two equivalent Mn(10)O4F2 octahedra, corners with two equivalent Mn(12)O5F octahedra, corners with four equivalent Mn(7)O4F2 octahedra,  an edgeedge with one Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. In the seventh Mn site, Mn(7) is bonded to one O(11), one O(12), one O(16), one O(3), one F(1), and one F(6) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(3)O4F2 octahedra, corners with two equivalent Mn(4)O4F2 octahedra, corners with four equivalent Mn(6)O3F3 octahedra,  an edgeedge with one Mn(10)O4F2 octahedra, and  an edgeedge with one Mn(12)O5F octahedra. The corner-sharing octahedral tilt angles range from 47-60°. In the eighth Mn site, Mn(8) is bonded to one O(10), one O(15), one O(17), one O(2), one O(7), and one F(3) atom to form MnO5F octahedra that share corners with two equivalent Mn(1)O4F2 octahedra, corners with two equivalent Mn(4)O4F2 octahedra, corners with four equivalent Mn(5)O4F2 octahedra,  an edgeedge with one Mn(11)O5F octahedra,  an edgeedge with one Mn(12)O5F octahedra, and faces with two equivalent Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 44-57°. In the ninth Mn site, Mn(9) is bonded to one O(1), one O(13), one O(14), one O(8), one O(9), and one F(2) atom to form MnO5F octahedra that share corners with two equivalent Mn(1)O4F2 octahedra, corners with two equivalent Mn(3)O4F2 octahedra, corners with four equivalent Mn(2)O4F2 octahedra,  an edgeedge with one Mn(10)O4F2 octahedra, and  an edgeedge with one Mn(11)O5F octahedra. The corner-sharing octahedral tilt angles range from 41-66°. In the tenth Mn site, Mn(10) is bonded to one O(12), one O(13), one O(4), one O(8), one F(1), and one F(5) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(6)O3F3 octahedra, corners with two equivalent Mn(2)O4F2 octahedra, corners with four equivalent Mn(3)O4F2 octahedra,  an edgeedge with one Mn(7)O4F2 octahedra, and  an edgeedge with one Mn(9)O5F octahedra. The corner-sharing octahedral tilt angles range from 42-63°. In the eleventh Mn site, Mn(11) is bonded to one O(14), one O(15), one O(5), one O(7), one O(9), and one F(4) atom to form MnO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Mn(2)O4F2 octahedra, corners with two equivalent Mn(5)O4F2 octahedra, corners with four equivalent Mn(1)O4F2 octahedra,  an edgeedge with one Mn(8)O5F octahedra, and  an edgeedge with one Mn(9)O5F octahedra. The corner-sharing octahedral tilt angles range from 40-66°. In the twelfth Mn site, Mn(12) is bonded to one O(10), one O(11), one O(16), one O(17), one O(6), and one F(7) atom to form distorted MnO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Mn(6)O3F3 octahedra, corners with two equivalent Mn(5)O4F2 octahedra, corners with four equivalent Mn(4)O4F2 octahedra,  an edgeedge with one Mn(7)O4F2 octahedra, and  an edgeedge with one Mn(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 43-64°. There are seventeen 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(9) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(3), one Mn(6), and one Mn(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(2), and one Mn(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Mn(11), and one Mn(5) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(12), one Mn(4), and one Mn(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(11), and one Mn(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(9) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(11), one Mn(2), and one Mn(9) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(12), one Mn(5), and one Mn(8) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(12), one Mn(4), and one Mn(7) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(7) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(2), and one Mn(9) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(11), and one Mn(9) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(11), one Mn(5), and one Mn(8) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Mn(12), one Mn(6), and one Mn(7) atom. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(12), one Mn(4), and one Mn(8) atom. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(6), and one Mn(7) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(3), and one Mn(9) atom. In the third F site, F(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(5), and one Mn(8) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(11), and one Mn(2) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(6) atom. In the sixth F site, F(6) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Mn(7) atom. In the seventh F site, F(7) is bonded in a 3-coordinate geometry to one Mn(12), one Mn(4), and one Mn(5) atom.
MgMn12O17F7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(15), one O(17), one O(2), one O(7), and one F(3) atom to form MgO5F octahedra that share corners with two equivalent Mn(11)O5F octahedra, corners with two equivalent Mn(12)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra,  an edgeedge with one Mn(4)O4F2 octahedra, edges with two equivalent Mn(5)O4F2 octahedra, and faces with two equivalent Mn(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 40-51°. The Mg(1)-O(10) bond length is 1.97 Å. The Mg(1)-O(15) bond length is 2.00 Å. The Mg(1)-O(17) bond length is 1.99 Å. The Mg(1)-O(2) bond length is 2.00 Å. The Mg(1)-O(7) bond length is 2.10 Å. The Mg(1)-F(3) bond length is 2.03 Å. There are twelve inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(14), one O(5), one O(7), one F(3), and one F(4) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(8)O5F octahedra, corners with two equivalent Mn(9)O5F octahedra, corners with four equivalent Mn(11)O5F octahedra,  an edgeedge with one Mg(1)O5F octahedra,  an edgeedge with one Mn(2)O4F2 octahedra, and  an edgeedge with one Mn(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 44-66°. The Mn(1)-O(1) bond length is 1.92 Å. The Mn(1)-O(14) bond length is 2.00 Å. The Mn(1)-O(5) bond length is 2.07 Å. The Mn(1)-O(7) bond length is 2.13 Å. The Mn(1)-F(3) bond length is 2.28 Å. The Mn(1)-F(4) bond length is 2.27 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(13), one O(4), one O(9), one F(2), and one F(4) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(10)O4F2 octahedra, corners with two equivalent Mn(11)O5F octahedra, corners with four equivalent Mn(9)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra, and  an edgeedge with one Mn(3)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. The Mn(2)-O(1) bond length is 2.03 Å. The Mn(2)-O(13) bond length is 2.05 Å. The Mn(2)-O(4) bond length is 1.90 Å. The Mn(2)-O(9) bond length is 2.11 Å. The Mn(2)-F(2) bond length is 2.30 Å. The Mn(2)-F(4) bond length is 2.10 Å. In the third Mn site, Mn(3) is bonded to one O(12), one O(3), one O(4), one O(8), one F(2), and one F(5) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(7)O4F2 octahedra, corners with two equivalent Mn(9)O5F octahedra, corners with four equivalent Mn(10)O4F2 octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, and  an edgeedge with one Mn(2)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 42-58°. The Mn(3)-O(12) bond length is 2.04 Å. The Mn(3)-O(3) bond length is 1.91 Å. The Mn(3)-O(4) bond length is 2.09 Å. The Mn(3)-O(8) bond length is 2.11 Å. The Mn(3)-F(2) bond length is 2.04 Å. The Mn(3)-F(5) bond length is 2.28 Å. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(17), one O(2), one O(6), one F(6), and one F(7) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(7)O4F2 octahedra, corners with two equivalent Mn(8)O5F octahedra, corners with four equivalent Mn(12)O5F octahedra,  an edgeedge with one Mg(1)O5F octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, and  an edgeedge with one Mn(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 45-64°. The Mn(4)-O(11) bond length is 1.85 Å. The Mn(4)-O(17) bond length is 2.31 Å. The Mn(4)-O(2) bond length is 2.13 Å. The Mn(4)-O(6) bond length is 2.01 Å. The Mn(4)-F(6) bond length is 2.07 Å. The Mn(4)-F(7) bond length is 2.00 Å. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(15), one O(2), one O(5), one F(3), and one F(7) atom to form distorted MnO4F2 octahedra that share corners with two equivalent Mn(11)O5F octahedra, corners with two equivalent Mn(12)O5F octahedra, corners with four equivalent Mn(8)O5F octahedra,  an edgeedge with one Mn(1)O4F2 octahedra,  an edgeedge with one Mn(4)O4F2 octahedra, and edges with two equivalent Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 43-59°. The Mn(5)-O(10) bond length is 2.15 Å. The Mn(5)-O(15) bond length is 2.09 Å. The Mn(5)-O(2) bond length is 1.99 Å. The Mn(5)-O(5) bond length is 1.88 Å. The Mn(5)-F(3) bond length is 2.20 Å. The Mn(5)-F(7) bond length is 2.03 Å. In the sixth Mn site, Mn(6) is bonded to one O(16), one O(3), one O(6), one F(1), one F(5), and one F(6) atom to form MnO3F3 octahedra that share corners with two equivalent Mn(10)O4F2 octahedra, corners with two equivalent Mn(12)O5F octahedra, corners with four equivalent Mn(7)O4F2 octahedra,  an edgeedge with one Mn(3)O4F2 octahedra, and  an edgeedge with one Mn(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. The Mn(6)-O(16) bond length is 1.96 Å. The Mn(6)-O(3) bond length is 2.02 Å. The Mn(6)-O(6) bond length is 1.96 Å. The Mn(6)-F(1) bond length is 2.11 Å. The Mn(6)-F(5) bond length is 2.07 Å. The Mn(6)-F(6) bond length is 2.15 Å. In the seventh Mn site, Mn(7) is bonded to one O(11), one O(12), one O(16), one O(3), one F(1), and one F(6) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(3)O4F2 octahedra, corners with two equivalent Mn(4)O4F2 octahedra, corners with four equivalent Mn(6)O3F3 octahedra,  an edgeedge with one Mn(10)O4F2 octahedra, and  an edgeedge with one Mn(12)O5F octahedra. The corner-sharing octahedral tilt angles range from 47-60°. The Mn(7)-O(11) bond length is 1.94 Å. The Mn(7)-O(12) bond length is 1.97 Å. The Mn(7)-O(16) bond length is 2.06 Å. The Mn(7)-O(3) bond length is 2.03 Å. The Mn(7)-F(1) bond length is 2.17 Å. The Mn(7)-F(6) bond length is 2.10 Å. In the eighth Mn site, Mn(8) is bonded to one O(10), one O(15), one O(17), one O(2), one O(7), and one F(3) atom to form MnO5F octahedra that share corners with two equivalent Mn(1)O4F2 octahedra, corners with two equivalent Mn(4)O4F2 octahedra, corners with four equivalent Mn(5)O4F2 octahedra,  an edgeedge with one Mn(11)O5F octahedra,  an edgeedge with one Mn(12)O5F octahedra, and faces with two equivalent Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 44-57°. The Mn(8)-O(10) bond length is 1.90 Å. The Mn(8)-O(15) bond length is 2.05 Å. The Mn(8)-O(17) bond length is 1.91 Å. The Mn(8)-O(2) bond length is 1.95 Å. The Mn(8)-O(7) bond length is 1.91 Å. The Mn(8)-F(3) bond length is 2.05 Å. In the ninth Mn site, Mn(9) is bonded to one O(1), one O(13), one O(14), one O(8), one O(9), and one F(2) atom to form MnO5F octahedra that share corners with two equivalent Mn(1)O4F2 octahedra, corners with two equivalent Mn(3)O4F2 octahedra, corners with four equivalent Mn(2)O4F2 octahedra,  an edgeedge with one Mn(10)O4F2 octahedra, and  an edgeedge with one Mn(11)O5F octahedra. The corner-sharing octahedral tilt angles range from 41-66°. The Mn(9)-O(1) bond length is 1.97 Å. The Mn(9)-O(13) bond length is 1.98 Å. The Mn(9)-O(14) bond length is 1.93 Å. The Mn(9)-O(8) bond length is 1.93 Å. The Mn(9)-O(9) bond length is 1.91 Å. The Mn(9)-F(2) bond length is 2.04 Å. In the tenth Mn site, Mn(10) is bonded to one O(12), one O(13), one O(4), one O(8), one F(1), and one F(5) atom to form MnO4F2 octahedra that share corners with two equivalent Mn(6)O3F3 octahedra, corners with two equivalent Mn(2)O4F2 octahedra, corners with four equivalent Mn(3)O4F2 octahedra,  an edgeedge with one Mn(7)O4F2 octahedra, and  an edgeedge with one Mn(9)O5F octahedra. The corner-sharing octahedral tilt angles range from 42-63°. The Mn(10)-O(12) bond length is 1.99 Å. The Mn(10)-O(13) bond length is 1.89 Å. The Mn(10)-O(4) bond length is 2.02 Å. The Mn(10)-O(8) bond length is 1.87 Å. The Mn(10)-F(1) bond length is 1.98 Å. The Mn(10)-F(5) bond length is 2.02 Å. In the eleventh Mn site, Mn(11) is bonded to one O(14), one O(15), one O(5), one O(7), one O(9), and one F(4) atom to form MnO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Mn(2)O4F2 octahedra, corners with two equivalent Mn(5)O4F2 octahedra, corners with four equivalent Mn(1)O4F2 octahedra,  an edgeedge with one Mn(8)O5F octahedra, and  an edgeedge with one Mn(9)O5F octahedra. The corner-sharing octahedral tilt angles range from 40-66°. The Mn(11)-O(14) bond length is 2.04 Å. The Mn(11)-O(15) bond length is 2.02 Å. The Mn(11)-O(5) bond length is 2.07 Å. The Mn(11)-O(7) bond length is 1.97 Å. The Mn(11)-O(9) bond length is 1.92 Å. The Mn(11)-F(4) bond length is 2.03 Å. In the twelfth Mn site, Mn(12) is bonded to one O(10), one O(11), one O(16), one O(17), one O(6), and one F(7) atom to form distorted MnO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Mn(6)O3F3 octahedra, corners with two equivalent Mn(5)O4F2 octahedra, corners with four equivalent Mn(4)O4F2 octahedra,  an edgeedge with one Mn(7)O4F2 octahedra, and  an edgeedge with one Mn(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 43-64°. The Mn(12)-O(10) bond length is 2.01 Å. The Mn(12)-O(11) bond length is 2.08 Å. The Mn(12)-O(16) bond length is 1.91 Å. The Mn(12)-O(17) bond length is 2.06 Å. The Mn(12)-O(6) bond length is 1.96 Å. The Mn(12)-F(7) bond length is 2.53 Å. There are seventeen 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(9) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(3), one Mn(6), and one Mn(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(2), and one Mn(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Mn(11), and one Mn(5) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(12), one Mn(4), and one Mn(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(11), and one Mn(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(9) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(11), one Mn(2), and one Mn(9) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(12), one Mn(5), and one Mn(8) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(12), one Mn(4), and one Mn(7) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(7) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(2), and one Mn(9) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(11), and one Mn(9) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(11), one Mn(5), and one Mn(8) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Mn(12), one Mn(6), and one Mn(7) atom. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(12), one Mn(4), and one Mn(8) atom. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(6), and one Mn(7) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(3), and one Mn(9) atom. In the third F site, F(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(5), and one Mn(8) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(11), and one Mn(2) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Mn(10), one Mn(3), and one Mn(6) atom. In the sixth F site, F(6) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Mn(7) atom. In the seventh F site, F(7) is bonded in a 3-coordinate geometry to one Mn(12), one Mn(4), and one Mn(5) atom.