ZnCrO4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form CrO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra and corners with four equivalent Zn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-64°. In the second Cr site, Cr(2) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form CrO4 tetrahedra that share corners with two equivalent Zn(2)O6 octahedra and corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-55°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra, corners with four equivalent Cr(2)O4 tetrahedra, and edges with two equivalent Zn(2)O6 octahedra. In the second Zn site, Zn(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent Cr(2)O4 tetrahedra, corners with four equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra, and edges with two equivalent Zn(1)O6 octahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Cr(1), one Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing OZn3Cr tetrahedra. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Zn(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one Zn(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Cr(1) and one Zn(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(2), one Zn(1), and one Zn(2) atom.
ZnCrO4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form CrO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra and corners with four equivalent Zn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-64°. The Cr(1)-O(1) bond length is 1.74 Å. The Cr(1)-O(2) bond length is 1.62 Å. Both Cr(1)-O(4) bond lengths are 1.62 Å. In the second Cr site, Cr(2) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form CrO4 tetrahedra that share corners with two equivalent Zn(2)O6 octahedra and corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-55°. Both Cr(2)-O(3) bond lengths are 1.62 Å. Both Cr(2)-O(5) bond lengths are 1.69 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra, corners with four equivalent Cr(2)O4 tetrahedra, and edges with two equivalent Zn(2)O6 octahedra. The Zn(1)-O(1) bond length is 2.13 Å. The Zn(1)-O(2) bond length is 2.00 Å. Both Zn(1)-O(3) bond lengths are 2.05 Å. Both Zn(1)-O(5) bond lengths are 2.10 Å. In the second Zn site, Zn(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent Cr(2)O4 tetrahedra, corners with four equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra, and edges with two equivalent Zn(1)O6 octahedra. Both Zn(2)-O(1) bond lengths are 2.16 Å. Both Zn(2)-O(4) bond lengths are 2.03 Å. Both Zn(2)-O(5) bond lengths are 2.07 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Cr(1), one Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing OZn3Cr tetrahedra. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Zn(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one Zn(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Cr(1) and one Zn(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(2), one Zn(1), and one Zn(2) atom.