cinnabar

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cinnabar The commonest mercury mineral, HgS; sp. gr. 8.0–8.2; hardness 2.0–2.5; trigonal; scarlet-red to brownish-red; vermilion streak; adamantine lustre; crystals rhombohedral or thick, tabular plates, but can occur massive or granular; cleavage perfect prismatic {101̄} sedimentary rocks, in fractures in areas of volcanic activity, and around hot springs, associated with pyrite, stibnite, and realgar. It is the only major ore of mercury.

cinnabar

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cin·na·bar / ˈsinəˌbär/ • n. a bright red mineral consisting of mercury sulfide. It is the only important ore of mercury and is sometimes used as a pigment. ∎  the bright red color of this; vermilion: [as adj.] the blood coagulated in cinnabar threads.

cinnabar

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cinnabar vermilion XV; red sulphide of mercury XVI. — L. cinnabaris — Gr. kinnábari.