MgMnAlS4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Mg(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form MgS4 tetrahedra that share corners with six equivalent Mn(1)S6 octahedra and corners with six equivalent Al(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 58-60°. Mn(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form MnS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Mn(1)S6 octahedra, and edges with four equivalent Al(1)S6 octahedra. Al(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form AlS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Al(1)S6 octahedra, and edges with four equivalent Mn(1)S6 octahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded to one Mg(1), two equivalent Mn(1), and one Al(1) atom to form distorted SMgMn2Al trigonal pyramids that share corners with six equivalent S(1)MgMn2Al trigonal pyramids, corners with six equivalent S(2)MgMnAl2 trigonal pyramids,  an edgeedge with one S(1)MgMn2Al trigonal pyramid, and edges with two equivalent S(2)MgMnAl2 trigonal pyramids. In the second S site, S(2) is bonded to one Mg(1), one Mn(1), and two equivalent Al(1) atoms to form distorted SMgMnAl2 trigonal pyramids that share corners with six equivalent S(1)MgMn2Al trigonal pyramids, corners with six equivalent S(2)MgMnAl2 trigonal pyramids,  an edgeedge with one S(2)MgMnAl2 trigonal pyramid, and edges with two equivalent S(1)MgMn2Al trigonal pyramids.
MgMnAlS4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Mg(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form MgS4 tetrahedra that share corners with six equivalent Mn(1)S6 octahedra and corners with six equivalent Al(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 58-60°. Both Mg(1)-S(1) bond lengths are 2.42 Å. Both Mg(1)-S(2) bond lengths are 2.45 Å. Mn(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form MnS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Mn(1)S6 octahedra, and edges with four equivalent Al(1)S6 octahedra. Both Mn(1)-S(2) bond lengths are 2.44 Å. All Mn(1)-S(1) bond lengths are 2.48 Å. Al(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form AlS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Al(1)S6 octahedra, and edges with four equivalent Mn(1)S6 octahedra. Both Al(1)-S(1) bond lengths are 2.41 Å. All Al(1)-S(2) bond lengths are 2.45 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one Mg(1), two equivalent Mn(1), and one Al(1) atom to form distorted SMgMn2Al trigonal pyramids that share corners with six equivalent S(1)MgMn2Al trigonal pyramids, corners with six equivalent S(2)MgMnAl2 trigonal pyramids,  an edgeedge with one S(1)MgMn2Al trigonal pyramid, and edges with two equivalent S(2)MgMnAl2 trigonal pyramids. In the second S site, S(2) is bonded to one Mg(1), one Mn(1), and two equivalent Al(1) atoms to form distorted SMgMnAl2 trigonal pyramids that share corners with six equivalent S(1)MgMn2Al trigonal pyramids, corners with six equivalent S(2)MgMnAl2 trigonal pyramids,  an edgeedge with one S(2)MgMnAl2 trigonal pyramid, and edges with two equivalent S(1)MgMn2Al trigonal pyramids.