Cr2ZnO7 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. In the second Cr site, Cr(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. Zn(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form ZnO4 trigonal pyramids that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cr(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cr(1) and one Zn(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(2) and one Zn(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one Zn(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(2) and one Zn(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Cr(1) atom.
Cr2ZnO7 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. The Cr(1)-O(2) bond length is 1.68 Å. The Cr(1)-O(4) bond length is 1.65 Å. The Cr(1)-O(6) bond length is 1.79 Å. The Cr(1)-O(7) bond length is 1.59 Å. In the second Cr site, Cr(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. The Cr(2)-O(1) bond length is 1.59 Å. The Cr(2)-O(3) bond length is 1.68 Å. The Cr(2)-O(5) bond length is 1.67 Å. The Cr(2)-O(6) bond length is 1.79 Å. Zn(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form ZnO4 trigonal pyramids that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. The Zn(1)-O(2) bond length is 1.98 Å. The Zn(1)-O(3) bond length is 1.96 Å. The Zn(1)-O(4) bond length is 2.04 Å. The Zn(1)-O(5) bond length is 1.98 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cr(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cr(1) and one Zn(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(2) and one Zn(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one Zn(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(2) and one Zn(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Cr(1) atom.