MnCo9O10 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. Mn(1) is bonded to two equivalent O(5) and four equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with four equivalent Co(2)O6 octahedra, and edges with four equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, edges with three equivalent Co(2)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Co site, Co(2) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with four equivalent Co(4)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third Co site, Co(3) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fourth Co site, Co(4) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth Co site, Co(5) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form CoO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, edges with four equivalent Co(2)O6 octahedra, and edges with four equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Co(1), two equivalent Co(4), and three equivalent Co(3) atoms to form OCo6 octahedra that share corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(5)MnCo5 octahedra, edges with two equivalent O(3)Co6 octahedra, edges with two equivalent O(4)Mn2Co4 octahedra, edges with three equivalent O(2)Co6 octahedra, and edges with four equivalent O(1)Co6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to one Co(2), one Co(4), two equivalent Co(3), and two equivalent Co(5) atoms to form OCo6 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, edges with two equivalent O(3)Co6 octahedra, edges with three equivalent O(1)Co6 octahedra, edges with three equivalent O(2)Co6 octahedra, and edges with four equivalent O(5)MnCo5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third O site, O(3) is bonded to one Co(3), two equivalent Co(2), and three equivalent Co(1) atoms to form OCo6 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(5)MnCo5 octahedra, edges with two equivalent O(1)Co6 octahedra, edges with two equivalent O(2)Co6 octahedra, edges with three equivalent O(4)Mn2Co4 octahedra, and edges with four equivalent O(3)Co6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fourth O site, O(4) is bonded to two equivalent Mn(1), one Co(2), one Co(4), and two equivalent Co(1) atoms to form OMn2Co4 octahedra that share corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, edges with two equivalent O(1)Co6 octahedra, edges with three equivalent O(3)Co6 octahedra, edges with three equivalent O(4)Mn2Co4 octahedra, and edges with four equivalent O(5)MnCo5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth O site, O(5) is bonded to one Mn(1), one Co(5), two equivalent Co(2), and two equivalent Co(4) atoms to form OMnCo5 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(1)Co6 octahedra,  an edgeedge with one O(3)Co6 octahedra, edges with two equivalent O(5)MnCo5 octahedra, edges with four equivalent O(2)Co6 octahedra, and edges with four equivalent O(4)Mn2Co4 octahedra. The corner-sharing octahedral tilt angles range from 0-1°.
MnCo9O10 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. Mn(1) is bonded to two equivalent O(5) and four equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with four equivalent Co(2)O6 octahedra, and edges with four equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. Both Mn(1)-O(5) bond lengths are 2.21 Å. All Mn(1)-O(4) bond lengths are 2.21 Å. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, edges with three equivalent Co(2)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Co(1)-O(1) bond length is 2.15 Å. Both Co(1)-O(4) bond lengths are 2.14 Å. There is one shorter (2.16 Å) and two longer (2.17 Å) Co(1)-O(3) bond lengths. In the second Co site, Co(2) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with four equivalent Co(4)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Co(2)-O(2) bond length is 2.15 Å. The Co(2)-O(4) bond length is 2.19 Å. Both Co(2)-O(3) bond lengths are 2.14 Å. Both Co(2)-O(5) bond lengths are 2.17 Å. In the third Co site, Co(3) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Co(3)-O(3) bond length is 2.17 Å. Both Co(3)-O(2) bond lengths are 2.15 Å. There are two shorter (2.15 Å) and one longer (2.16 Å) Co(3)-O(1) bond length. In the fourth Co site, Co(4) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Co(4)-O(2) bond length is 2.13 Å. The Co(4)-O(4) bond length is 2.17 Å. Both Co(4)-O(1) bond lengths are 2.15 Å. Both Co(4)-O(5) bond lengths are 2.19 Å. In the fifth Co site, Co(5) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form CoO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, edges with four equivalent Co(2)O6 octahedra, and edges with four equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Both Co(5)-O(5) bond lengths are 2.11 Å. All Co(5)-O(2) bond lengths are 2.18 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Co(1), two equivalent Co(4), and three equivalent Co(3) atoms to form OCo6 octahedra that share corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(5)MnCo5 octahedra, edges with two equivalent O(3)Co6 octahedra, edges with two equivalent O(4)Mn2Co4 octahedra, edges with three equivalent O(2)Co6 octahedra, and edges with four equivalent O(1)Co6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to one Co(2), one Co(4), two equivalent Co(3), and two equivalent Co(5) atoms to form OCo6 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, edges with two equivalent O(3)Co6 octahedra, edges with three equivalent O(1)Co6 octahedra, edges with three equivalent O(2)Co6 octahedra, and edges with four equivalent O(5)MnCo5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third O site, O(3) is bonded to one Co(3), two equivalent Co(2), and three equivalent Co(1) atoms to form OCo6 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(5)MnCo5 octahedra, edges with two equivalent O(1)Co6 octahedra, edges with two equivalent O(2)Co6 octahedra, edges with three equivalent O(4)Mn2Co4 octahedra, and edges with four equivalent O(3)Co6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fourth O site, O(4) is bonded to two equivalent Mn(1), one Co(2), one Co(4), and two equivalent Co(1) atoms to form OMn2Co4 octahedra that share corners with two equivalent O(2)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(4)Mn2Co4 octahedra, edges with two equivalent O(1)Co6 octahedra, edges with three equivalent O(3)Co6 octahedra, edges with three equivalent O(4)Mn2Co4 octahedra, and edges with four equivalent O(5)MnCo5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth O site, O(5) is bonded to one Mn(1), one Co(5), two equivalent Co(2), and two equivalent Co(4) atoms to form OMnCo5 octahedra that share corners with two equivalent O(1)Co6 octahedra, corners with two equivalent O(3)Co6 octahedra, corners with two equivalent O(5)MnCo5 octahedra,  an edgeedge with one O(1)Co6 octahedra,  an edgeedge with one O(3)Co6 octahedra, edges with two equivalent O(5)MnCo5 octahedra, edges with four equivalent O(2)Co6 octahedra, and edges with four equivalent O(4)Mn2Co4 octahedra. The corner-sharing octahedral tilt angles range from 0-1°.