Na2HgS2 crystallizes in the orthorhombic Pbca space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent S(1) and four equivalent S(2) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one S(2) and three equivalent S(1) atoms. Hg(1) is bonded in a distorted linear geometry to one S(1) and one S(2) atom. There are two inequivalent S sites. In the first S site, S(2) is bonded in a 6-coordinate geometry to one Na(2), four equivalent Na(1), and one Hg(1) atom. In the second S site, S(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), three equivalent Na(2), and one Hg(1) atom.
Na2HgS2 crystallizes in the orthorhombic Pbca space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent S(1) and four equivalent S(2) atoms. There is one shorter (2.91 Å) and one longer (3.25 Å) Na(1)-S(1) bond length. There are a spread of Na(1)-S(2) bond distances ranging from 2.89-3.15 Å. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one S(2) and three equivalent S(1) atoms. The Na(2)-S(2) bond length is 2.86 Å. There are a spread of Na(2)-S(1) bond distances ranging from 2.73-2.76 Å. Hg(1) is bonded in a distorted linear geometry to one S(1) and one S(2) atom. The Hg(1)-S(1) bond length is 2.34 Å. The Hg(1)-S(2) bond length is 2.34 Å. There are two inequivalent S sites. In the first S site, S(2) is bonded in a 6-coordinate geometry to one Na(2), four equivalent Na(1), and one Hg(1) atom. In the second S site, S(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), three equivalent Na(2), and one Hg(1) atom.