MgMn6(OF2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(3), one O(4), one F(1), one F(3), one F(4), and one F(7) atom to form MgO2F4 octahedra that share  an edgeedge with one Mn(4)O2F4 octahedra,  an edgeedge with one Mn(6)OF5 octahedra, edges with two equivalent Mn(5)O2F4 octahedra, and faces with two equivalent Mn(3)O2F4 octahedra. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one F(5), and one F(8) atom. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one F(5) atom. In the third Mn site, Mn(3) is bonded to one O(3), one O(4), one F(1), one F(3), one F(4), and one F(7) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(6)OF5 octahedra, corners with four equivalent Mn(5)O2F4 octahedra, and faces with two equivalent Mg(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 40-49°. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(2), one F(1), one F(4), one F(6), and one F(8) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mg(1)O2F4 octahedra,  an edgeedge with one Mn(5)O2F4 octahedra, and  an edgeedge with one Mn(6)OF5 octahedra. The corner-sharing octahedral tilt angles range from 40-49°. In the fifth Mn site, Mn(5) is bonded to one O(3), one O(4), one F(1), one F(2), one F(6), and one F(7) atom to form MnO2F4 octahedra that share corners with four equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mn(4)O2F4 octahedra,  an edgeedge with one Mn(6)OF5 octahedra, and edges with two equivalent Mg(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 43-48°. In the sixth Mn site, Mn(6) is bonded to one O(1), one F(2), one F(3), one F(5), one F(7), and one F(8) atom to form distorted MnOF5 octahedra that share corners with two equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mg(1)O2F4 octahedra,  an edgeedge with one Mn(4)O2F4 octahedra, and  an edgeedge with one Mn(5)O2F4 octahedra. The corner-sharing octahedral tilt angles are 44°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2), one Mn(4), and one Mn(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded to one Mg(1), one Mn(2), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OMgMn3 tetrahedra. In the fourth O site, O(4) is bonded to one Mg(1), one Mn(1), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OMgMn3 trigonal pyramids. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(4), and one Mn(5) atom. In the second F site, F(2) is bonded in a water-like geometry to one Mn(5) and one Mn(6) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(3), and one Mn(6) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(3), and one Mn(4) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(6) atom. In the sixth F site, F(6) is bonded in a water-like geometry to one Mn(4) and one Mn(5) atom. In the seventh F site, F(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(5), and one Mn(6) atom. In the eighth F site, F(8) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(4), and one Mn(6) atom.
MgMn6(OF2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(3), one O(4), one F(1), one F(3), one F(4), and one F(7) atom to form MgO2F4 octahedra that share  an edgeedge with one Mn(4)O2F4 octahedra,  an edgeedge with one Mn(6)OF5 octahedra, edges with two equivalent Mn(5)O2F4 octahedra, and faces with two equivalent Mn(3)O2F4 octahedra. The Mg(1)-O(3) bond length is 2.11 Å. The Mg(1)-O(4) bond length is 2.06 Å. The Mg(1)-F(1) bond length is 1.98 Å. The Mg(1)-F(3) bond length is 2.03 Å. The Mg(1)-F(4) bond length is 2.09 Å. The Mg(1)-F(7) bond length is 1.96 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one F(5), and one F(8) atom. The Mn(1)-O(2) bond length is 2.03 Å. The Mn(1)-O(4) bond length is 2.06 Å. The Mn(1)-F(5) bond length is 2.18 Å. The Mn(1)-F(8) bond length is 2.14 Å. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one F(5) atom. The Mn(2)-O(1) bond length is 1.95 Å. The Mn(2)-O(2) bond length is 1.99 Å. The Mn(2)-O(3) bond length is 2.00 Å. The Mn(2)-F(5) bond length is 2.23 Å. In the third Mn site, Mn(3) is bonded to one O(3), one O(4), one F(1), one F(3), one F(4), and one F(7) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mn(4)O2F4 octahedra, corners with two equivalent Mn(6)OF5 octahedra, corners with four equivalent Mn(5)O2F4 octahedra, and faces with two equivalent Mg(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 40-49°. The Mn(3)-O(3) bond length is 2.12 Å. The Mn(3)-O(4) bond length is 2.10 Å. The Mn(3)-F(1) bond length is 2.33 Å. The Mn(3)-F(3) bond length is 2.11 Å. The Mn(3)-F(4) bond length is 2.11 Å. The Mn(3)-F(7) bond length is 2.48 Å. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(2), one F(1), one F(4), one F(6), and one F(8) atom to form distorted MnO2F4 octahedra that share corners with two equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mg(1)O2F4 octahedra,  an edgeedge with one Mn(5)O2F4 octahedra, and  an edgeedge with one Mn(6)OF5 octahedra. The corner-sharing octahedral tilt angles range from 40-49°. The Mn(4)-O(1) bond length is 1.90 Å. The Mn(4)-O(2) bond length is 1.86 Å. The Mn(4)-F(1) bond length is 2.44 Å. The Mn(4)-F(4) bond length is 2.05 Å. The Mn(4)-F(6) bond length is 1.97 Å. The Mn(4)-F(8) bond length is 2.21 Å. In the fifth Mn site, Mn(5) is bonded to one O(3), one O(4), one F(1), one F(2), one F(6), and one F(7) atom to form MnO2F4 octahedra that share corners with four equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mn(4)O2F4 octahedra,  an edgeedge with one Mn(6)OF5 octahedra, and edges with two equivalent Mg(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 43-48°. The Mn(5)-O(3) bond length is 2.18 Å. The Mn(5)-O(4) bond length is 2.14 Å. The Mn(5)-F(1) bond length is 2.24 Å. The Mn(5)-F(2) bond length is 2.03 Å. The Mn(5)-F(6) bond length is 2.09 Å. The Mn(5)-F(7) bond length is 2.19 Å. In the sixth Mn site, Mn(6) is bonded to one O(1), one F(2), one F(3), one F(5), one F(7), and one F(8) atom to form distorted MnOF5 octahedra that share corners with two equivalent Mn(3)O2F4 octahedra,  an edgeedge with one Mg(1)O2F4 octahedra,  an edgeedge with one Mn(4)O2F4 octahedra, and  an edgeedge with one Mn(5)O2F4 octahedra. The corner-sharing octahedral tilt angles are 44°. The Mn(6)-O(1) bond length is 2.04 Å. The Mn(6)-F(2) bond length is 2.05 Å. The Mn(6)-F(3) bond length is 2.17 Å. The Mn(6)-F(5) bond length is 2.07 Å. The Mn(6)-F(7) bond length is 2.55 Å. The Mn(6)-F(8) bond length is 2.14 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2), one Mn(4), and one Mn(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded to one Mg(1), one Mn(2), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OMgMn3 tetrahedra. In the fourth O site, O(4) is bonded to one Mg(1), one Mn(1), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OMgMn3 trigonal pyramids. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(4), and one Mn(5) atom. In the second F site, F(2) is bonded in a water-like geometry to one Mn(5) and one Mn(6) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(3), and one Mn(6) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(3), and one Mn(4) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(6) atom. In the sixth F site, F(6) is bonded in a water-like geometry to one Mn(4) and one Mn(5) atom. In the seventh F site, F(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(5), and one Mn(6) atom. In the eighth F site, F(8) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(4), and one Mn(6) atom.