Structure
HgS adopts two structures, i.e. it is dimorphous. The more stable form is cinnabar, which has a structure akin to that for HgO: each Hg center has two short Hg-S bonds (2.36 Å), and four longer Hg---S contacts (3.10, 3.10, 3.30, 3.30 Å). The black form of HgS has the zincblende structure.
Read more about this topic: Cinnabar
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—Karl Wilhelm Von Humboldt (1767–1835)