MgPm2S4 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a trigonal pyramidal geometry to one S(2), one S(3), and two equivalent S(1) atoms. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(3), and four equivalent S(1) atoms. In the second Pm site, Pm(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), and four equivalent S(1) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Pm(1), and two equivalent Pm(2) atoms. In the second S site, S(2) is bonded in a T-shaped geometry to one Mg(1), one Pm(1), and one Pm(2) atom. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Pm(2), and two equivalent Pm(1) atoms.
MgPm2S4 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a trigonal pyramidal geometry to one S(2), one S(3), and two equivalent S(1) atoms. The Mg(1)-S(2) bond length is 2.33 Å. The Mg(1)-S(3) bond length is 2.42 Å. Both Mg(1)-S(1) bond lengths are 2.43 Å. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(3), and four equivalent S(1) atoms. The Pm(1)-S(2) bond length is 2.85 Å. There is one shorter (2.78 Å) and one longer (2.80 Å) Pm(1)-S(3) bond length. There are two shorter (2.92 Å) and two longer (3.25 Å) Pm(1)-S(1) bond lengths. In the second Pm site, Pm(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), and four equivalent S(1) atoms. The Pm(2)-S(2) bond length is 2.67 Å. The Pm(2)-S(3) bond length is 2.90 Å. There are two shorter (2.85 Å) and two longer (2.98 Å) Pm(2)-S(1) bond lengths. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Pm(1), and two equivalent Pm(2) atoms. In the second S site, S(2) is bonded in a T-shaped geometry to one Mg(1), one Pm(1), and one Pm(2) atom. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Pm(2), and two equivalent Pm(1) atoms.