CrSb(PO4)2 crystallizes in the monoclinic P2_1/m space group. Cr(1) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with four equivalent Sb(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 45-56°. Sb(1) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 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 45-56°. 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(3) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with three equivalent Cr(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the second P site, P(2) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Sb(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-63°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cr(1), one Sb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(1), one Sb(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(2) atom.
CrSb(PO4)2 crystallizes in the monoclinic P2_1/m space group. Cr(1) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with four equivalent Sb(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 45-56°. The Cr(1)-O(1) bond length is 1.98 Å. The Cr(1)-O(5) bond length is 2.00 Å. Both Cr(1)-O(3) bond lengths are 2.12 Å. Both Cr(1)-O(4) bond lengths are 2.07 Å. Sb(1) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 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 45-56°. The Sb(1)-O(2) bond length is 2.13 Å. The Sb(1)-O(6) bond length is 2.40 Å. Both Sb(1)-O(3) bond lengths are 2.34 Å. Both Sb(1)-O(4) bond lengths are 2.29 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(3) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with three equivalent Cr(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.54 Å. Both P(1)-O(3) bond lengths are 1.59 Å. In the second P site, P(2) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Sb(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-63°. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.50 Å. Both P(2)-O(4) bond lengths are 1.60 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cr(1), one Sb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(1), one Sb(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(2) atom.