Mn13Al4Si2(SbO14)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 53-64°. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(6), and two equivalent O(7) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 54-66°. In the third Mn site, Mn(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(5)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. In the fourth Mn site, Mn(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Mn(2)O5 trigonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Mn(5)O6 octahedra. In the fifth Mn site, Mn(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, edges with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and corners with four equivalent Mn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 53-67°. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and corners with six equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 57-64°. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(4)O6 octahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with three equivalent Mn(3)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mn(2), two equivalent Mn(1), and one Al(1) atom to form distorted OMn3Al tetrahedra that share  a cornercorner with one O(5)Mn2AlSb tetrahedra,  a cornercorner with one O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(1)Mn3Al tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(5), and one Si(1) atom to form distorted OMn3Si trigonal pyramids that share corners with four equivalent O(6)Mn3Sb tetrahedra,  a cornercorner with one O(4)Mn3Si trigonal pyramid, edges with two equivalent O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(4)Mn3Si trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Mn(3), one Al(1), and one Sb(1) atom to form distorted OMn2AlSb tetrahedra that share  a cornercorner with one O(1)Mn3Al tetrahedra, corners with two equivalent O(6)Mn3Sb tetrahedra, corners with three equivalent O(5)Mn2AlSb tetrahedra, and edges with two equivalent O(5)Mn2AlSb tetrahedra. In the sixth O site, O(6) is bonded to one Mn(2), one Mn(4), one Mn(5), and one Sb(1) atom to form distorted OMn3Sb tetrahedra that share  a cornercorner with one O(1)Mn3Al tetrahedra, corners with two equivalent O(5)Mn2AlSb tetrahedra, corners with three equivalent O(6)Mn3Sb tetrahedra, corners with two equivalent O(4)Mn3Si trigonal pyramids,  an edgeedge with one O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(4)Mn3Si trigonal pyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), two equivalent Mn(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mn(1), one Mn(3), one Mn(5), and one Sb(1) atom.
Mn13Al4Si2(SbO14)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 53-64°. The Mn(1)-O(2) bond length is 2.17 Å. The Mn(1)-O(7) bond length is 2.19 Å. The Mn(1)-O(8) bond length is 2.14 Å. There is one shorter (2.16 Å) and one longer (2.21 Å) Mn(1)-O(1) bond length. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(6), and two equivalent O(7) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 54-66°. The Mn(2)-O(1) bond length is 2.07 Å. The Mn(2)-O(3) bond length is 2.05 Å. The Mn(2)-O(6) bond length is 2.13 Å. There is one shorter (2.12 Å) and one longer (2.47 Å) Mn(2)-O(7) bond length. In the third Mn site, Mn(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(5)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. Both Mn(3)-O(8) bond lengths are 2.23 Å. There are two shorter (2.24 Å) and two longer (2.30 Å) Mn(3)-O(5) bond lengths. In the fourth Mn site, Mn(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Mn(2)O5 trigonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Mn(5)O6 octahedra. Both Mn(4)-O(4) bond lengths are 2.31 Å. All Mn(4)-O(6) bond lengths are 2.27 Å. In the fifth Mn site, Mn(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, edges with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Mn(5)-O(4) bond lengths are 2.21 Å. Both Mn(5)-O(6) bond lengths are 2.20 Å. Both Mn(5)-O(8) bond lengths are 2.31 Å. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and corners with four equivalent Mn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 53-67°. The Al(1)-O(1) bond length is 1.77 Å. The Al(1)-O(5) bond length is 1.82 Å. Both Al(1)-O(2) bond lengths are 1.78 Å. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and corners with six equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 57-64°. The Si(1)-O(3) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.65 Å. Both Si(1)-O(7) bond lengths are 1.67 Å. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(4)O6 octahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with three equivalent Mn(3)O6 octahedra. Both Sb(1)-O(5) bond lengths are 2.07 Å. Both Sb(1)-O(6) bond lengths are 2.01 Å. Both Sb(1)-O(8) bond lengths are 2.01 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mn(2), two equivalent Mn(1), and one Al(1) atom to form distorted OMn3Al tetrahedra that share  a cornercorner with one O(5)Mn2AlSb tetrahedra,  a cornercorner with one O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(1)Mn3Al tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(5), and one Si(1) atom to form distorted OMn3Si trigonal pyramids that share corners with four equivalent O(6)Mn3Sb tetrahedra,  a cornercorner with one O(4)Mn3Si trigonal pyramid, edges with two equivalent O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(4)Mn3Si trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Mn(3), one Al(1), and one Sb(1) atom to form distorted OMn2AlSb tetrahedra that share  a cornercorner with one O(1)Mn3Al tetrahedra, corners with two equivalent O(6)Mn3Sb tetrahedra, corners with three equivalent O(5)Mn2AlSb tetrahedra, and edges with two equivalent O(5)Mn2AlSb tetrahedra. In the sixth O site, O(6) is bonded to one Mn(2), one Mn(4), one Mn(5), and one Sb(1) atom to form distorted OMn3Sb tetrahedra that share  a cornercorner with one O(1)Mn3Al tetrahedra, corners with two equivalent O(5)Mn2AlSb tetrahedra, corners with three equivalent O(6)Mn3Sb tetrahedra, corners with two equivalent O(4)Mn3Si trigonal pyramids,  an edgeedge with one O(6)Mn3Sb tetrahedra, and  an edgeedge with one O(4)Mn3Si trigonal pyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), two equivalent Mn(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mn(1), one Mn(3), one Mn(5), and one Sb(1) atom.