HgS

These samples of cinnabar are displayed in the Smithsonian Museum of Natural History. Cinnabar is a sulfide mineral of mercury with the composition HgS. The sample at left is about 12 cm across and is from Castilla la Nue, Ciudad Real, Almaden, Spain.

This specimen of cinnabar is from Hunan Province, China and is about 15 cm across.

This sample is cinnabar with quartz and dolomite. The sample is about 10 cm wide and is from Hunan, China. It includes one large, twinned cinnabar crystal and several smaller ones, all dark red. Cinnabar is the major ore of mercury.