HgS-Li2S: The phase diagram is not constructed. Li2Hg6S7 could not be prepared under the synthetic ux conditions (Axtell et al. 1998).
HgS-Na2S: The phase diagram is not constructed. Na2Hg3S4 was obtained by the interaction of stoichiometric quantity of Na2S and HgS at 600°C (Klepp 1992). It crystallizes in an orthorhombic structure with lattice parameters a = 730.8 ± 0.5, b = 1401.1 ± 0.8, and c = 823.1 ± 0.3 pm.