ScMn2O4 is Spinel-like structured and crystallizes in the monoclinic C2/m space group. Sc(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ScO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Sc(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form MnO4 tetrahedra that share corners with three equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, and corners with six equivalent Sc(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-62°. In the second Mn site, Mn(2) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with four equivalent Sc(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with four equivalent Sc(1)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sc(1), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted OScMn3 tetrahedra that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids,  an edgeedge with one O(1)ScMn3 tetrahedra,  an edgeedge with one O(2)Sc2Mn2 trigonal pyramid, and  an edgeedge with one O(3)Sc2Mn2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Sc(1), one Mn(1), and one Mn(3) atom to form distorted OSc2Mn2 trigonal pyramids that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids, edges with two equivalent O(1)ScMn3 tetrahedra, and  an edgeedge with one O(3)Sc2Mn2 trigonal pyramid. In the third O site, O(3) is bonded to two equivalent Sc(1), one Mn(1), and one Mn(2) atom to form distorted OSc2Mn2 trigonal pyramids that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids, edges with two equivalent O(1)ScMn3 tetrahedra, and  an edgeedge with one O(2)Sc2Mn2 trigonal pyramid.
ScMn2O4 is Spinel-like structured and crystallizes in the monoclinic C2/m space group. Sc(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ScO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Sc(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. Both Sc(1)-O(1) bond lengths are 2.20 Å. Both Sc(1)-O(2) bond lengths are 2.08 Å. Both Sc(1)-O(3) bond lengths are 2.09 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form MnO4 tetrahedra that share corners with three equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, and corners with six equivalent Sc(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-62°. The Mn(1)-O(2) bond length is 2.03 Å. The Mn(1)-O(3) bond length is 2.03 Å. Both Mn(1)-O(1) bond lengths are 2.15 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with four equivalent Sc(1)O6 octahedra. Both Mn(2)-O(3) bond lengths are 2.25 Å. All Mn(2)-O(1) bond lengths are 2.01 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with four equivalent Sc(1)O6 octahedra. Both Mn(3)-O(2) bond lengths are 2.25 Å. All Mn(3)-O(1) bond lengths are 2.02 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sc(1), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted OScMn3 tetrahedra that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids,  an edgeedge with one O(1)ScMn3 tetrahedra,  an edgeedge with one O(2)Sc2Mn2 trigonal pyramid, and  an edgeedge with one O(3)Sc2Mn2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Sc(1), one Mn(1), and one Mn(3) atom to form distorted OSc2Mn2 trigonal pyramids that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids, edges with two equivalent O(1)ScMn3 tetrahedra, and  an edgeedge with one O(3)Sc2Mn2 trigonal pyramid. In the third O site, O(3) is bonded to two equivalent Sc(1), one Mn(1), and one Mn(2) atom to form distorted OSc2Mn2 trigonal pyramids that share corners with six equivalent O(1)ScMn3 tetrahedra, corners with three equivalent O(2)Sc2Mn2 trigonal pyramids, corners with three equivalent O(3)Sc2Mn2 trigonal pyramids, edges with two equivalent O(1)ScMn3 tetrahedra, and  an edgeedge with one O(2)Sc2Mn2 trigonal pyramid.