MgMnF5 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one F(1), one F(3), one F(4), one F(5), and two equivalent F(2) atoms to form distorted MgF6 octahedra that share corners with five equivalent Mn(1)F6 octahedra,  an edgeedge with one Mg(1)F6 octahedra, and  an edgeedge with one Mn(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 11-55°. Mn(1) is bonded to one F(1), one F(2), one F(3), one F(4), and two equivalent F(5) atoms to form MnF6 octahedra that share corners with two equivalent Mn(1)F6 octahedra, corners with five equivalent Mg(1)F6 octahedra, and  an edgeedge with one Mg(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 11-55°. There are five inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one Mn(1) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Mn(1) atom. In the third F site, F(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Mn(1) atom. In the fourth F site, F(4) is bonded in a linear geometry to one Mg(1) and one Mn(1) atom. In the fifth F site, F(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Mn(1) atoms.
MgMnF5 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one F(1), one F(3), one F(4), one F(5), and two equivalent F(2) atoms to form distorted MgF6 octahedra that share corners with five equivalent Mn(1)F6 octahedra,  an edgeedge with one Mg(1)F6 octahedra, and  an edgeedge with one Mn(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 11-55°. The Mg(1)-F(1) bond length is 2.00 Å. The Mg(1)-F(3) bond length is 1.98 Å. The Mg(1)-F(4) bond length is 1.98 Å. The Mg(1)-F(5) bond length is 2.02 Å. There is one shorter (2.04 Å) and one longer (2.24 Å) Mg(1)-F(2) bond length. Mn(1) is bonded to one F(1), one F(2), one F(3), one F(4), and two equivalent F(5) atoms to form MnF6 octahedra that share corners with two equivalent Mn(1)F6 octahedra, corners with five equivalent Mg(1)F6 octahedra, and  an edgeedge with one Mg(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 11-55°. The Mn(1)-F(1) bond length is 1.92 Å. The Mn(1)-F(2) bond length is 1.92 Å. The Mn(1)-F(3) bond length is 1.84 Å. The Mn(1)-F(4) bond length is 1.89 Å. There is one shorter (2.14 Å) and one longer (2.18 Å) Mn(1)-F(5) bond length. There are five inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one Mn(1) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Mn(1) atom. In the third F site, F(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Mn(1) atom. In the fourth F site, F(4) is bonded in a linear geometry to one Mg(1) and one Mn(1) atom. In the fifth F site, F(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Mn(1) atoms.