MgFeAgS2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent Ag(1) and three equivalent S(1) atoms. Fe(1) is bonded to three equivalent S(1) and three equivalent S(2) atoms to form edge-sharing FeS6 octahedra. Ag(1) is bonded in a 6-coordinate geometry to three equivalent Mg(1) and three equivalent S(2) atoms. There are two inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Mg(1) and three equivalent Fe(1) atoms to form distorted edge-sharing SMg3Fe3 pentagonal pyramids. In the second S site, S(2) is bonded in a 6-coordinate geometry to three equivalent Fe(1) and three equivalent Ag(1) atoms.
MgFeAgS2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent Ag(1) and three equivalent S(1) atoms. All Mg(1)-Ag(1) bond lengths are 2.90 Å. All Mg(1)-S(1) bond lengths are 2.55 Å. Fe(1) is bonded to three equivalent S(1) and three equivalent S(2) atoms to form edge-sharing FeS6 octahedra. All Fe(1)-S(1) bond lengths are 2.42 Å. All Fe(1)-S(2) bond lengths are 2.22 Å. Ag(1) is bonded in a 6-coordinate geometry to three equivalent Mg(1) and three equivalent S(2) atoms. There is one shorter (2.96 Å) and two longer (2.98 Å) Ag(1)-S(2) bond lengths. There are two inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Mg(1) and three equivalent Fe(1) atoms to form distorted edge-sharing SMg3Fe3 pentagonal pyramids. In the second S site, S(2) is bonded in a 6-coordinate geometry to three equivalent Fe(1) and three equivalent Ag(1) atoms.