Cinnabar is a bright red mineral primarily composed of mercury sulfide (HgS). It is the most important ore of mercury and has been used for centuries in various applications, including pigments for art and cosmetics. The striking red color of cinnabar has made it a popular choice for decorative items and traditional Chinese lacquerware. In addition to its aesthetic uses, cinnabar is significant in geology and mining. It typically forms in hydrothermal veins and can be found in regions with volcanic activity. However, due to its mercury content, cinnabar can be toxic, and proper precautions are necessary when handling it.