MgFeAg2SnS4 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to one Ag(1), two equivalent S(1), and two equivalent S(2) atoms to form distorted MgAgS4 tetrahedra that share edges with two equivalent Fe(1)S4 tetrahedra. Fe(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form distorted FeS4 tetrahedra that share edges with two equivalent Mg(1)AgS4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent S(1), and two equivalent S(2) atoms. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent S(2) atoms. Sn(1) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent S(2) atoms. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Ag(1), one Ag(2), and one Sn(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Ag(1), one Ag(2), and one Sn(1) atom.
MgFeAg2SnS4 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to one Ag(1), two equivalent S(1), and two equivalent S(2) atoms to form distorted MgAgS4 tetrahedra that share edges with two equivalent Fe(1)S4 tetrahedra. The Mg(1)-Ag(1) bond length is 3.04 Å. Both Mg(1)-S(1) bond lengths are 2.48 Å. Both Mg(1)-S(2) bond lengths are 2.47 Å. Fe(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form distorted FeS4 tetrahedra that share edges with two equivalent Mg(1)AgS4 tetrahedra. Both Fe(1)-S(1) bond lengths are 2.33 Å. Both Fe(1)-S(2) bond lengths are 2.32 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent S(1), and two equivalent S(2) atoms. Both Ag(1)-S(1) bond lengths are 2.68 Å. Both Ag(1)-S(2) bond lengths are 2.60 Å. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent S(2) atoms. Both Ag(2)-S(1) bond lengths are 2.61 Å. Both Ag(2)-S(2) bond lengths are 2.67 Å. Sn(1) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent S(2) atoms. Both Sn(1)-S(1) bond lengths are 2.83 Å. Both Sn(1)-S(2) bond lengths are 2.84 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Ag(1), one Ag(2), and one Sn(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Ag(1), one Ag(2), and one Sn(1) atom.