Cr2Zn(PO4)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(7) atom. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. In the third Cr site, Cr(3) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted CrO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. Zn(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 pentagonal pyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(3), one Zn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom.
Cr2Zn(PO4)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(7) atom. The Cr(1)-O(2) bond length is 2.03 Å. The Cr(1)-O(4) bond length is 2.11 Å. The Cr(1)-O(6) bond length is 2.14 Å. The Cr(1)-O(7) bond length is 2.08 Å. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Cr(2)-O(1) bond lengths are 2.04 Å. Both Cr(2)-O(4) bond lengths are 2.11 Å. In the third Cr site, Cr(3) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted CrO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. Both Cr(3)-O(5) bond lengths are 2.13 Å. Both Cr(3)-O(6) bond lengths are 2.57 Å. Both Cr(3)-O(7) bond lengths are 2.04 Å. Zn(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(8) atom. The Zn(1)-O(2) bond length is 2.17 Å. The Zn(1)-O(3) bond length is 2.06 Å. The Zn(1)-O(6) bond length is 2.21 Å. The Zn(1)-O(8) bond length is 1.95 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 pentagonal pyramid. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.59 Å. The P(1)-O(7) bond length is 1.58 Å. The P(1)-O(8) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 pentagonal pyramids. The P(2)-O(2) bond length is 1.57 Å. The P(2)-O(3) bond length is 1.57 Å. The P(2)-O(5) bond length is 1.51 Å. The P(2)-O(6) bond length is 1.59 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(3), one Zn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom.