CrSn(PO4)2 crystallizes in the monoclinic P2_1/m space group. Cr(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with four equivalent Sn(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. Sn(1) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form SnO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra, corners with three equivalent Cr(1)O6 octahedra, and  an edgeedge with one Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-56°. In the second P site, P(2) is bonded to one O(3), one O(4), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Sn(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(1), one Sn(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Cr(1), one Sn(1), and one P(2) atom.
CrSn(PO4)2 crystallizes in the monoclinic P2_1/m space group. Cr(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with four equivalent Sn(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. The Cr(1)-O(1) bond length is 2.03 Å. The Cr(1)-O(3) bond length is 2.02 Å. Both Cr(1)-O(5) bond lengths are 2.15 Å. Both Cr(1)-O(6) bond lengths are 2.49 Å. Sn(1) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form SnO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. The Sn(1)-O(2) bond length is 2.03 Å. The Sn(1)-O(4) bond length is 2.03 Å. Both Sn(1)-O(5) bond lengths are 2.17 Å. Both Sn(1)-O(6) bond lengths are 2.12 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra, corners with three equivalent Cr(1)O6 octahedra, and  an edgeedge with one Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-56°. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.55 Å. Both P(1)-O(5) bond lengths are 1.59 Å. In the second P site, P(2) is bonded to one O(3), one O(4), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Sn(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. The P(2)-O(3) bond length is 1.51 Å. The P(2)-O(4) bond length is 1.56 Å. Both P(2)-O(6) bond lengths are 1.58 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(1), one Sn(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Cr(1), one Sn(1), and one P(2) atom.