ZnSeO4 crystallizes in the orthorhombic Cmcm space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Se(1)O4 tetrahedra and edges with two equivalent Zn(1)O6 octahedra. Se(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SeO4 tetrahedra that share corners with six equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Se(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(1) atom.
ZnSeO4 crystallizes in the orthorhombic Cmcm space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Se(1)O4 tetrahedra and edges with two equivalent Zn(1)O6 octahedra. Both Zn(1)-O(2) bond lengths are 2.01 Å. All Zn(1)-O(1) bond lengths are 2.15 Å. Se(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SeO4 tetrahedra that share corners with six equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. Both Se(1)-O(1) bond lengths are 1.68 Å. Both Se(1)-O(2) bond lengths are 1.64 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Se(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(1) atom.