FeMnO4 crystallizes in the orthorhombic Imma space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-57°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Mn(1) and one Fe(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Fe(1) atom.
FeMnO4 crystallizes in the orthorhombic Imma space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Both Mn(1)-O(1) bond lengths are 1.90 Å. All Mn(1)-O(2) bond lengths are 1.95 Å. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-57°. Both Fe(1)-O(1) bond lengths are 1.83 Å. Both Fe(1)-O(2) bond lengths are 1.91 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Mn(1) and one Fe(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Fe(1) atom.