Cinnabar. View of a specimen of the red mineral cinnabar (mercury sulphide). Cinnabar is the most important ore of mercury. Although it does not melt with heat, when heated above 580 degrees Celsius it sublimates, depositing drops of mercury. Cinnabar usually occurs in microcrystalline or earthy masses, but sometimes the rhombohedral crystals seen here are found. It was once used as the colourant vermilion.
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