Mg2WGa3S8 is Spinel-derived structured and crystallizes in the trigonal R-3m space group. Mg(1) is bonded to one S(2) and three equivalent S(1) atoms to form MgS4 tetrahedra that share corners with three equivalent W(1)S6 octahedra and corners with nine equivalent Ga(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 58-59°. W(1) is bonded to six equivalent S(1) atoms to form WS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra and edges with six equivalent Ga(1)S6 octahedra. Ga(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form GaS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent W(1)S6 octahedra, and edges with four equivalent Ga(1)S6 octahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), and two equivalent Ga(1) atoms. In the second S site, S(2) is bonded to one Mg(1) and three equivalent Ga(1) atoms to form distorted corner-sharing SMgGa3 trigonal pyramids.
Mg2WGa3S8 is Spinel-derived structured and crystallizes in the trigonal R-3m space group. Mg(1) is bonded to one S(2) and three equivalent S(1) atoms to form MgS4 tetrahedra that share corners with three equivalent W(1)S6 octahedra and corners with nine equivalent Ga(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 58-59°. The Mg(1)-S(2) bond length is 2.46 Å. All Mg(1)-S(1) bond lengths are 2.47 Å. W(1) is bonded to six equivalent S(1) atoms to form WS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra and edges with six equivalent Ga(1)S6 octahedra. All W(1)-S(1) bond lengths are 2.47 Å. Ga(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form GaS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent W(1)S6 octahedra, and edges with four equivalent Ga(1)S6 octahedra. Both Ga(1)-S(2) bond lengths are 2.50 Å. All Ga(1)-S(1) bond lengths are 2.50 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), and two equivalent Ga(1) atoms. In the second S site, S(2) is bonded to one Mg(1) and three equivalent Ga(1) atoms to form distorted corner-sharing SMgGa3 trigonal pyramids.