MgLaS3 is Ilmenite-like structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form distorted MgS6 octahedra that share corners with four equivalent La(1)S6 pentagonal pyramids, edges with three equivalent Mg(1)S6 octahedra, and edges with four equivalent La(1)S6 pentagonal pyramids. La(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form distorted LaS6 pentagonal pyramids that share corners with four equivalent Mg(1)S6 octahedra, edges with four equivalent Mg(1)S6 octahedra,  an edgeedge with one La(1)S6 pentagonal pyramid, and  a faceface with one La(1)S6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 39-49°. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent La(1) atoms. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent La(1) atoms.
MgLaS3 is Ilmenite-like structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form distorted MgS6 octahedra that share corners with four equivalent La(1)S6 pentagonal pyramids, edges with three equivalent Mg(1)S6 octahedra, and edges with four equivalent La(1)S6 pentagonal pyramids. Both Mg(1)-S(2) bond lengths are 2.53 Å. There are two shorter (2.56 Å) and two longer (3.01 Å) Mg(1)-S(1) bond lengths. La(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form distorted LaS6 pentagonal pyramids that share corners with four equivalent Mg(1)S6 octahedra, edges with four equivalent Mg(1)S6 octahedra,  an edgeedge with one La(1)S6 pentagonal pyramid, and  a faceface with one La(1)S6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 39-49°. Both La(1)-S(2) bond lengths are 2.85 Å. There are two shorter (2.81 Å) and two longer (3.08 Å) La(1)-S(1) bond lengths. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent La(1) atoms. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent La(1) atoms.