Pr2Mn3Sb3O14 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form PrO8 hexagonal bipyramids that share edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(2)O8 hexagonal bipyramids, edges with two equivalent Mn(3)O8 hexagonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, edges with two equivalent Mn(3)O8 hexagonal bipyramids, and edges with four equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-52°. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(4) atoms to form distorted MnO8 hexagonal bipyramids that share edges with two equivalent Mn(3)O8 hexagonal bipyramids, edges with four equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Sb(2)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms to form distorted MnO8 hexagonal bipyramids that share edges with two equivalent Mn(2)O8 hexagonal bipyramids, edges with four equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with four equivalent Sb(2)O6 octahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, edges with two equivalent Mn(2)O8 hexagonal bipyramids, and edges with four equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-52°. In the second Sb site, Sb(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(2)O8 hexagonal bipyramids, and edges with two equivalent Mn(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-48°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1), one Mn(1), and one Sb(1) atom to form distorted OPr2MnSb tetrahedra that share corners with two equivalent O(5)Pr2Mn2 tetrahedra, corners with four equivalent O(1)Pr2MnSb tetrahedra, corners with four equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(5)Pr2Mn2 tetrahedra, and edges with two equivalent O(4)PrMnSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(3), and two equivalent Sb(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), one Mn(1), one Mn(3), and one Sb(2) atom. In the fourth O site, O(4) is bonded to one Pr(1), one Mn(2), one Sb(1), and one Sb(2) atom to form distorted OPrMnSb2 tetrahedra that share corners with two equivalent O(5)Pr2Mn2 tetrahedra, corners with two equivalent O(1)Pr2MnSb tetrahedra, corners with six equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(5)Pr2Mn2 tetrahedra,  an edgeedge with one O(1)Pr2MnSb tetrahedra, and  an edgeedge with one O(4)PrMnSb2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Pr(1), one Mn(2), and one Mn(3) atom to form OPr2Mn2 tetrahedra that share corners with two equivalent O(1)Pr2MnSb tetrahedra, corners with four equivalent O(5)Pr2Mn2 tetrahedra, corners with four equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(1)Pr2MnSb tetrahedra, and edges with two equivalent O(4)PrMnSb2 tetrahedra.
Pr2Mn3Sb3O14 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form PrO8 hexagonal bipyramids that share edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(2)O8 hexagonal bipyramids, edges with two equivalent Mn(3)O8 hexagonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Pr(1)-O(1) bond lengths are 2.51 Å. Both Pr(1)-O(3) bond lengths are 2.59 Å. Both Pr(1)-O(4) bond lengths are 2.58 Å. Both Pr(1)-O(5) bond lengths are 2.38 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, edges with two equivalent Mn(3)O8 hexagonal bipyramids, and edges with four equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-52°. Both Mn(1)-O(1) bond lengths are 2.16 Å. All Mn(1)-O(3) bond lengths are 1.99 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(4) atoms to form distorted MnO8 hexagonal bipyramids that share edges with two equivalent Mn(3)O8 hexagonal bipyramids, edges with four equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Sb(2)O6 octahedra. Both Mn(2)-O(2) bond lengths are 2.65 Å. Both Mn(2)-O(5) bond lengths are 2.11 Å. All Mn(2)-O(4) bond lengths are 2.60 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms to form distorted MnO8 hexagonal bipyramids that share edges with two equivalent Mn(2)O8 hexagonal bipyramids, edges with four equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with four equivalent Sb(2)O6 octahedra. Both Mn(3)-O(2) bond lengths are 2.52 Å. Both Mn(3)-O(5) bond lengths are 2.19 Å. All Mn(3)-O(3) bond lengths are 2.62 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, edges with two equivalent Mn(2)O8 hexagonal bipyramids, and edges with four equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-52°. Both Sb(1)-O(1) bond lengths are 1.96 Å. All Sb(1)-O(4) bond lengths are 2.03 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Mn(2)O8 hexagonal bipyramids, and edges with two equivalent Mn(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-48°. Both Sb(2)-O(2) bond lengths are 2.02 Å. Both Sb(2)-O(3) bond lengths are 1.99 Å. Both Sb(2)-O(4) bond lengths are 2.01 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1), one Mn(1), and one Sb(1) atom to form distorted OPr2MnSb tetrahedra that share corners with two equivalent O(5)Pr2Mn2 tetrahedra, corners with four equivalent O(1)Pr2MnSb tetrahedra, corners with four equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(5)Pr2Mn2 tetrahedra, and edges with two equivalent O(4)PrMnSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(3), and two equivalent Sb(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), one Mn(1), one Mn(3), and one Sb(2) atom. In the fourth O site, O(4) is bonded to one Pr(1), one Mn(2), one Sb(1), and one Sb(2) atom to form distorted OPrMnSb2 tetrahedra that share corners with two equivalent O(5)Pr2Mn2 tetrahedra, corners with two equivalent O(1)Pr2MnSb tetrahedra, corners with six equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(5)Pr2Mn2 tetrahedra,  an edgeedge with one O(1)Pr2MnSb tetrahedra, and  an edgeedge with one O(4)PrMnSb2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Pr(1), one Mn(2), and one Mn(3) atom to form OPr2Mn2 tetrahedra that share corners with two equivalent O(1)Pr2MnSb tetrahedra, corners with four equivalent O(5)Pr2Mn2 tetrahedra, corners with four equivalent O(4)PrMnSb2 tetrahedra,  an edgeedge with one O(1)Pr2MnSb tetrahedra, and edges with two equivalent O(4)PrMnSb2 tetrahedra.