ScMnGaS4 is Spinel-derived structured and crystallizes in the orthorhombic Pnma space group. Sc(1) is bonded to one S(1), one S(2), and four equivalent S(3) atoms to form ScS6 octahedra that share corners with four equivalent Sc(1)S6 octahedra, corners with four equivalent Mn(1)S6 octahedra, corners with four equivalent Ga(1)S4 tetrahedra, edges with two equivalent Mn(1)S6 octahedra, and  an edgeedge with one Ga(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-55°. Mn(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form MnS6 octahedra that share corners with four equivalent Sc(1)S6 octahedra, corners with two equivalent Ga(1)S4 tetrahedra, edges with two equivalent Sc(1)S6 octahedra, edges with two equivalent Mn(1)S6 octahedra, and edges with two equivalent Ga(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. Ga(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form GaS4 tetrahedra that share corners with two equivalent Mn(1)S6 octahedra, corners with four equivalent Sc(1)S6 octahedra,  an edgeedge with one Sc(1)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 60-64°. There are three inequivalent S sites. In the first S site, S(1) is bonded to one Sc(1), two equivalent Mn(1), and one Ga(1) atom to form distorted corner-sharing SScMn2Ga trigonal pyramids. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Sc(1), two equivalent Mn(1), and one Ga(1) atom. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to two equivalent Sc(1), one Mn(1), and one Ga(1) atom.
ScMnGaS4 is Spinel-derived structured and crystallizes in the orthorhombic Pnma space group. Sc(1) is bonded to one S(1), one S(2), and four equivalent S(3) atoms to form ScS6 octahedra that share corners with four equivalent Sc(1)S6 octahedra, corners with four equivalent Mn(1)S6 octahedra, corners with four equivalent Ga(1)S4 tetrahedra, edges with two equivalent Mn(1)S6 octahedra, and  an edgeedge with one Ga(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-55°. The Sc(1)-S(1) bond length is 2.61 Å. The Sc(1)-S(2) bond length is 2.58 Å. There are two shorter (2.61 Å) and two longer (2.66 Å) Sc(1)-S(3) bond lengths. Mn(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form MnS6 octahedra that share corners with four equivalent Sc(1)S6 octahedra, corners with two equivalent Ga(1)S4 tetrahedra, edges with two equivalent Sc(1)S6 octahedra, edges with two equivalent Mn(1)S6 octahedra, and edges with two equivalent Ga(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. Both Mn(1)-S(1) bond lengths are 2.54 Å. Both Mn(1)-S(2) bond lengths are 2.58 Å. Both Mn(1)-S(3) bond lengths are 2.63 Å. Ga(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form GaS4 tetrahedra that share corners with two equivalent Mn(1)S6 octahedra, corners with four equivalent Sc(1)S6 octahedra,  an edgeedge with one Sc(1)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 60-64°. The Ga(1)-S(1) bond length is 2.25 Å. The Ga(1)-S(2) bond length is 2.31 Å. Both Ga(1)-S(3) bond lengths are 2.32 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded to one Sc(1), two equivalent Mn(1), and one Ga(1) atom to form distorted corner-sharing SScMn2Ga trigonal pyramids. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Sc(1), two equivalent Mn(1), and one Ga(1) atom. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to two equivalent Sc(1), one Mn(1), and one Ga(1) atom.