CrMn7O16 is trigonal omega-derived structured and crystallizes in the monoclinic P2/m space group. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form MnO6 octahedra that share edges with two equivalent Cr(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(5) and four equivalent O(6) atoms to form edge-sharing MnO6 octahedra. In the fourth Mn site, Mn(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form edge-sharing MnO6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Cr(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Cr(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mn(4) and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(4) atom.
CrMn7O16 is trigonal omega-derived structured and crystallizes in the monoclinic P2/m space group. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. Both Cr(1)-O(2) bond lengths are 1.96 Å. All Cr(1)-O(1) bond lengths are 1.95 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form MnO6 octahedra that share edges with two equivalent Cr(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. Both Mn(1)-O(3) bond lengths are 1.94 Å. All Mn(1)-O(1) bond lengths are 1.94 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. The Mn(2)-O(1) bond length is 1.94 Å. The Mn(2)-O(2) bond length is 1.94 Å. The Mn(2)-O(3) bond length is 1.95 Å. The Mn(2)-O(4) bond length is 1.94 Å. The Mn(2)-O(5) bond length is 1.95 Å. The Mn(2)-O(6) bond length is 1.95 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(5) and four equivalent O(6) atoms to form edge-sharing MnO6 octahedra. Both Mn(3)-O(5) bond lengths are 1.94 Å. All Mn(3)-O(6) bond lengths are 1.95 Å. In the fourth Mn site, Mn(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form edge-sharing MnO6 octahedra. Both Mn(4)-O(4) bond lengths are 1.94 Å. All Mn(4)-O(6) bond lengths are 1.94 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Cr(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Cr(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mn(4) and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(4) atom.