Lu2Mn3Sb3O14 crystallizes in the monoclinic C2/m space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms to form distorted LuO8 hexagonal bipyramids that share edges with two equivalent Sb(1)O6 octahedra and edges with four equivalent Sb(2)O6 octahedra. In the second Lu site, Lu(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Mn site, Mn(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-52°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, and edges with two equivalent Lu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 47-50°. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Lu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-52°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Lu(1), one Lu(2), and two equivalent Mn(1) atoms to form OLu2Mn2 tetrahedra that share corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with four equivalent O(1)Lu2Mn2 tetrahedra, corners with four equivalent O(4)LuMn2Sb tetrahedra, corners with four equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra, edges with two equivalent O(4)LuMn2Sb tetrahedra, and edges with two equivalent O(5)LuMnSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Lu(1), one Lu(2), and two equivalent Sb(2) atoms to form distorted OLu2Sb2 tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with four equivalent O(3)Lu2Sb2 tetrahedra, corners with four equivalent O(4)LuMn2Sb tetrahedra, corners with four equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra, edges with two equivalent O(4)LuMn2Sb tetrahedra, and edges with two equivalent O(5)LuMnSb2 tetrahedra. In the fourth O site, O(4) is bonded to one Lu(2), one Mn(1), one Mn(2), and one Sb(2) atom to form distorted OLuMn2Sb tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with two equivalent O(5)LuMnSb2 tetrahedra, corners with six equivalent O(4)LuMn2Sb tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra,  an edgeedge with one O(4)LuMn2Sb tetrahedra, and  an edgeedge with one O(5)LuMnSb2 tetrahedra. In the fifth O site, O(5) is bonded to one Lu(1), one Mn(1), one Sb(1), and one Sb(2) atom to form distorted OLuMnSb2 tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with two equivalent O(4)LuMn2Sb tetrahedra, corners with six equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra,  an edgeedge with one O(4)LuMn2Sb tetrahedra, and  an edgeedge with one O(5)LuMnSb2 tetrahedra.
Lu2Mn3Sb3O14 crystallizes in the monoclinic C2/m space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms to form distorted LuO8 hexagonal bipyramids that share edges with two equivalent Sb(1)O6 octahedra and edges with four equivalent Sb(2)O6 octahedra. Both Lu(1)-O(1) bond lengths are 2.18 Å. Both Lu(1)-O(3) bond lengths are 2.45 Å. All Lu(1)-O(5) bond lengths are 2.48 Å. In the second Lu site, Lu(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. Both Lu(2)-O(1) bond lengths are 2.22 Å. Both Lu(2)-O(3) bond lengths are 2.53 Å. All Lu(2)-O(4) bond lengths are 2.44 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Both Mn(1)-O(1) bond lengths are 2.24 Å. Both Mn(1)-O(2) bond lengths are 2.55 Å. Both Mn(1)-O(4) bond lengths are 2.52 Å. Both Mn(1)-O(5) bond lengths are 2.51 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-52°. Both Mn(2)-O(2) bond lengths are 1.95 Å. All Mn(2)-O(4) bond lengths are 2.07 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, and edges with two equivalent Lu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 47-50°. Both Sb(1)-O(2) bond lengths are 1.98 Å. All Sb(1)-O(5) bond lengths are 2.00 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Lu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-52°. Both Sb(2)-O(3) bond lengths are 2.02 Å. Both Sb(2)-O(4) bond lengths are 1.95 Å. Both Sb(2)-O(5) bond lengths are 2.01 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Lu(1), one Lu(2), and two equivalent Mn(1) atoms to form OLu2Mn2 tetrahedra that share corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with four equivalent O(1)Lu2Mn2 tetrahedra, corners with four equivalent O(4)LuMn2Sb tetrahedra, corners with four equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra, edges with two equivalent O(4)LuMn2Sb tetrahedra, and edges with two equivalent O(5)LuMnSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Lu(1), one Lu(2), and two equivalent Sb(2) atoms to form distorted OLu2Sb2 tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with four equivalent O(3)Lu2Sb2 tetrahedra, corners with four equivalent O(4)LuMn2Sb tetrahedra, corners with four equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra, edges with two equivalent O(4)LuMn2Sb tetrahedra, and edges with two equivalent O(5)LuMnSb2 tetrahedra. In the fourth O site, O(4) is bonded to one Lu(2), one Mn(1), one Mn(2), and one Sb(2) atom to form distorted OLuMn2Sb tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with two equivalent O(5)LuMnSb2 tetrahedra, corners with six equivalent O(4)LuMn2Sb tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra,  an edgeedge with one O(4)LuMn2Sb tetrahedra, and  an edgeedge with one O(5)LuMnSb2 tetrahedra. In the fifth O site, O(5) is bonded to one Lu(1), one Mn(1), one Sb(1), and one Sb(2) atom to form distorted OLuMnSb2 tetrahedra that share corners with two equivalent O(1)Lu2Mn2 tetrahedra, corners with two equivalent O(3)Lu2Sb2 tetrahedra, corners with two equivalent O(4)LuMn2Sb tetrahedra, corners with six equivalent O(5)LuMnSb2 tetrahedra,  an edgeedge with one O(1)Lu2Mn2 tetrahedra,  an edgeedge with one O(3)Lu2Sb2 tetrahedra,  an edgeedge with one O(4)LuMn2Sb tetrahedra, and  an edgeedge with one O(5)LuMnSb2 tetrahedra.