Here is a stunning example of red mercury in the form of cinnabar in quartz. Cinnabar or vermilion is natural red mercury(II) sulfide. Although there has been speculation that red mercury may be a nuclear material, this form of red mercury is not radioactive. Encased in quartz, it is one of the safer ways to have mercury, an extremely toxic element.
Learn About Red MercuryWhat Is Red Mercury?
Old Sewing Machines Believed to Contain Red Mercury
Radioactive Red Mercury with Uranium
Thoughts About Red Mercury