ScMo3O8 is trigonal omega-derived structured and crystallizes in the hexagonal P6_3mc space group. Sc(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form ScO6 octahedra that share corners with six equivalent Mo(1)O6 octahedra and edges with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. Mo(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MoO6 octahedra that share corners with two equivalent Sc(1)O6 octahedra,  an edgeedge with one Sc(1)O6 octahedra, and edges with four equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sc(1) and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Sc(1) and two equivalent Mo(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to three equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mo(1) atoms.
ScMo3O8 is trigonal omega-derived structured and crystallizes in the hexagonal P6_3mc space group. Sc(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form ScO6 octahedra that share corners with six equivalent Mo(1)O6 octahedra and edges with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. All Sc(1)-O(1) bond lengths are 2.13 Å. All Sc(1)-O(2) bond lengths are 2.14 Å. Mo(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MoO6 octahedra that share corners with two equivalent Sc(1)O6 octahedra,  an edgeedge with one Sc(1)O6 octahedra, and edges with four equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. The Mo(1)-O(3) bond length is 2.08 Å. The Mo(1)-O(4) bond length is 2.10 Å. Both Mo(1)-O(1) bond lengths are 2.01 Å. Both Mo(1)-O(2) bond lengths are 2.05 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sc(1) and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Sc(1) and two equivalent Mo(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to three equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mo(1) atoms.