CaPr(SbO3)2 crystallizes in the orthorhombic Cmmm space group. Ca(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Pr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1), two equivalent Pr(1), and two equivalent Sb(1) atoms to form distorted OCa2Pr2Sb2 octahedra that share corners with six equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(2)Ca2Sb2 tetrahedra, corners with four equivalent O(3)Pr2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, edges with four equivalent O(2)Ca2Sb2 tetrahedra, and edges with four equivalent O(3)Pr2Sb2 tetrahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to two equivalent Ca(1) and two equivalent Sb(1) atoms to form distorted OCa2Sb2 tetrahedra that share corners with four equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(3)Pr2Sb2 tetrahedra, corners with six equivalent O(2)Ca2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, and  an edgeedge with one O(2)Ca2Sb2 tetrahedra. The corner-sharing octahedral tilt angles are 67°. In the third O site, O(3) is bonded to two equivalent Pr(1) and two equivalent Sb(1) atoms to form distorted OPr2Sb2 tetrahedra that share corners with four equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(2)Ca2Sb2 tetrahedra, corners with six equivalent O(3)Pr2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, and  an edgeedge with one O(3)Pr2Sb2 tetrahedra. The corner-sharing octahedral tilt angles are 68°.
CaPr(SbO3)2 crystallizes in the orthorhombic Cmmm space group. Ca(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All Ca(1)-O(1) bond lengths are 2.95 Å. All Ca(1)-O(2) bond lengths are 2.58 Å. Pr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. All Pr(1)-O(1) bond lengths are 2.95 Å. All Pr(1)-O(3) bond lengths are 2.54 Å. Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. Both Sb(1)-O(1) bond lengths are 2.15 Å. Both Sb(1)-O(2) bond lengths are 2.20 Å. Both Sb(1)-O(3) bond lengths are 2.20 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1), two equivalent Pr(1), and two equivalent Sb(1) atoms to form distorted OCa2Pr2Sb2 octahedra that share corners with six equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(2)Ca2Sb2 tetrahedra, corners with four equivalent O(3)Pr2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, edges with four equivalent O(2)Ca2Sb2 tetrahedra, and edges with four equivalent O(3)Pr2Sb2 tetrahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to two equivalent Ca(1) and two equivalent Sb(1) atoms to form distorted OCa2Sb2 tetrahedra that share corners with four equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(3)Pr2Sb2 tetrahedra, corners with six equivalent O(2)Ca2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, and  an edgeedge with one O(2)Ca2Sb2 tetrahedra. The corner-sharing octahedral tilt angles are 67°. In the third O site, O(3) is bonded to two equivalent Pr(1) and two equivalent Sb(1) atoms to form distorted OPr2Sb2 tetrahedra that share corners with four equivalent O(1)Ca2Pr2Sb2 octahedra, corners with four equivalent O(2)Ca2Sb2 tetrahedra, corners with six equivalent O(3)Pr2Sb2 tetrahedra, edges with four equivalent O(1)Ca2Pr2Sb2 octahedra, and  an edgeedge with one O(3)Pr2Sb2 tetrahedra. The corner-sharing octahedral tilt angles are 68°.