Formula: HgS
Specific gravity: 8.1
Hardness: 2 2½
Streak: Red
Colour: Red
Solubility: Insoluble in hydrochloric acid, sulphuric and nitric acid

Metamorphic environments
Fumeroles and hot spring deposits
Hydrothermal environments

Cinnabar occurs in the oxidation zone of epithermal (low temperature) hydrothermal veins, at fumeroles, and also in hot springs. It may be associated with baryte, native mercury, pyrite, marcasite, opal, quartz, realgar, stibnite, and sulphides of copper. Cinnabar is the most important ore of mercury but is found in quantity at comparatively few locations.

At the Rutland Cavern, Heights of Abraham, Matlock Bath, Derbyshire, England, UK, cinnabar has been found associated with smithsonite, and as minute specks dusting the surface of both smithsonite and fluorite (RES p51).

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