Mg11Mn2O13 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the second Mg site, Mg(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(5)O6 octahedra, and edges with four equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Mg site, Mg(3) is bonded to two equivalent O(4) and four equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with five equivalent Mg(4)O6 octahedra, and edges with six equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Mg site, Mg(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra, and edges with five equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the fifth Mg site, Mg(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the sixth Mg site, Mg(6) is bonded to two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Mn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are seven inequivalent O sites. In the first O site, O(5) is bonded to two equivalent Mg(4) and four equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(7)Mg4Mn2 octahedra, edges with five equivalent O(4)Mg4Mn2 octahedra, and edges with six equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the second O site, O(6) is bonded to two equivalent Mg(2), two equivalent Mg(5), and two equivalent Mg(6) atoms to form OMg6 octahedra that share corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(1)Mg6 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(7)Mg4Mn2 octahedra,  an edgeedge with one O(1)Mg6 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with four equivalent O(2)Mg4Mn2 octahedra, and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(7) is bonded to two equivalent Mg(4), two equivalent Mg(6), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(5)Mg6 octahedra,  an edgeedge with one O(6)Mg6 octahedra, edges with two equivalent O(7)Mg4Mn2 octahedra, edges with four equivalent O(2)Mg4Mn2 octahedra, and edges with four equivalent O(4)Mg4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(1) is bonded to two equivalent Mg(1) and four equivalent Mg(5) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(2) is bonded to two equivalent Mg(2), two equivalent Mg(6), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(3)Mg6 octahedra,  an edgeedge with one O(4)Mg4Mn2 octahedra,  an edgeedge with one O(3)Mg6 octahedra, edges with two equivalent O(2)Mg4Mn2 octahedra, edges with four equivalent O(7)Mg4Mn2 octahedra, and edges with four equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the sixth O site, O(3) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(5) atoms to form OMg6 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with four equivalent O(3)Mg6 octahedra,  an edgeedge with one O(2)Mg4Mn2 octahedra, edges with three equivalent O(3)Mg6 octahedra, edges with four equivalent O(1)Mg6 octahedra, and edges with four equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the seventh O site, O(4) is bonded to two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(2)Mg4Mn2 octahedra, edges with two equivalent O(4)Mg4Mn2 octahedra, edges with four equivalent O(7)Mg4Mn2 octahedra, and edges with five equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°.
Mg11Mn2O13 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. Both Mg(1)-O(1) bond lengths are 2.15 Å. All Mg(1)-O(3) bond lengths are 2.14 Å. In the second Mg site, Mg(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(5)O6 octahedra, and edges with four equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Mg(2)-O(2) bond lengths are 2.11 Å. Both Mg(2)-O(3) bond lengths are 2.14 Å. Both Mg(2)-O(6) bond lengths are 2.15 Å. In the third Mg site, Mg(3) is bonded to two equivalent O(4) and four equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with five equivalent Mg(4)O6 octahedra, and edges with six equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Mg(3)-O(4) bond lengths are 2.10 Å. There are two shorter (2.14 Å) and two longer (2.15 Å) Mg(3)-O(5) bond lengths. In the fourth Mg site, Mg(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra, and edges with five equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. Both Mg(4)-O(4) bond lengths are 2.15 Å. Both Mg(4)-O(5) bond lengths are 2.13 Å. Both Mg(4)-O(7) bond lengths are 2.18 Å. In the fifth Mg site, Mg(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. Both Mg(5)-O(1) bond lengths are 2.14 Å. Both Mg(5)-O(3) bond lengths are 2.15 Å. Both Mg(5)-O(6) bond lengths are 2.15 Å. In the sixth Mg site, Mg(6) is bonded to two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Mg(6)-O(2) bond lengths are 2.15 Å. Both Mg(6)-O(6) bond lengths are 2.14 Å. Both Mg(6)-O(7) bond lengths are 2.18 Å. Mn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with four equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Mn(1)-O(2) bond lengths are 2.22 Å. Both Mn(1)-O(4) bond lengths are 2.22 Å. Both Mn(1)-O(7) bond lengths are 2.15 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded to two equivalent Mg(4) and four equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(7)Mg4Mn2 octahedra, edges with five equivalent O(4)Mg4Mn2 octahedra, and edges with six equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the second O site, O(6) is bonded to two equivalent Mg(2), two equivalent Mg(5), and two equivalent Mg(6) atoms to form OMg6 octahedra that share corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(1)Mg6 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(7)Mg4Mn2 octahedra,  an edgeedge with one O(1)Mg6 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with four equivalent O(2)Mg4Mn2 octahedra, and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(7) is bonded to two equivalent Mg(4), two equivalent Mg(6), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(7)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(6)Mg6 octahedra,  an edgeedge with one O(5)Mg6 octahedra,  an edgeedge with one O(6)Mg6 octahedra, edges with two equivalent O(7)Mg4Mn2 octahedra, edges with four equivalent O(2)Mg4Mn2 octahedra, and edges with four equivalent O(4)Mg4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(1) is bonded to two equivalent Mg(1) and four equivalent Mg(5) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(2) is bonded to two equivalent Mg(2), two equivalent Mg(6), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(3)Mg6 octahedra,  an edgeedge with one O(4)Mg4Mn2 octahedra,  an edgeedge with one O(3)Mg6 octahedra, edges with two equivalent O(2)Mg4Mn2 octahedra, edges with four equivalent O(7)Mg4Mn2 octahedra, and edges with four equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the sixth O site, O(3) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(5) atoms to form OMg6 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with four equivalent O(3)Mg6 octahedra,  an edgeedge with one O(2)Mg4Mn2 octahedra, edges with three equivalent O(3)Mg6 octahedra, edges with four equivalent O(1)Mg6 octahedra, and edges with four equivalent O(6)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the seventh O site, O(4) is bonded to two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mn(1) atoms to form OMg4Mn2 octahedra that share corners with two equivalent O(2)Mg4Mn2 octahedra, corners with two equivalent O(4)Mg4Mn2 octahedra, corners with two equivalent O(5)Mg6 octahedra,  an edgeedge with one O(2)Mg4Mn2 octahedra, edges with two equivalent O(4)Mg4Mn2 octahedra, edges with four equivalent O(7)Mg4Mn2 octahedra, and edges with five equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°.