MgF3 crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent F(1) and eight equivalent F(2) atoms to form a mixture of face, corner, and edge-sharing MgF12 cuboctahedra. There are two inequivalent F sites. In the first F site, F(1) is bonded in a square co-planar geometry to four equivalent Mg(1) atoms. In the second F site, F(2) is bonded in a 4-coordinate geometry to four equivalent Mg(1) atoms.
MgF3 crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent F(1) and eight equivalent F(2) atoms to form a mixture of face, corner, and edge-sharing MgF12 cuboctahedra. All Mg(1)-F(1) bond lengths are 2.22 Å. All Mg(1)-F(2) bond lengths are 2.52 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded in a square co-planar geometry to four equivalent Mg(1) atoms. In the second F site, F(2) is bonded in a 4-coordinate geometry to four equivalent Mg(1) atoms.