MnSeO3 crystallizes in the orthorhombic Pnma space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 52-57°. Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to two equivalent Mn(1) and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Se(1) atom.
MnSeO3 crystallizes in the orthorhombic Pnma space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 52-57°. Both Mn(1)-O(1) bond lengths are 2.28 Å. There are two shorter (2.20 Å) and two longer (2.31 Å) Mn(1)-O(2) bond lengths. Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. The Se(1)-O(1) bond length is 1.74 Å. Both Se(1)-O(2) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to two equivalent Mn(1) and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Se(1) atom.