Definition of "metacinnabar" [metacinnabar]

• A isometric-hextetrahedral form of the mineral, cinnabar, containing mercury and sulfur and ranging from black to grayish white. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Aged fillings, however, typically contain a form of mercury, called beta-mercuric sulfide or metacinnabar, which is unlikely to be toxic in the body."
• "While the fresh fillings contained metallic mercury, which can be toxic, aged fillings contained a form of mercury called beta-mercuric sulfide or metacinnabar which is unlikely to be toxic in the body."
• "Minor sources include the black or gray sulphide, metacinnabar, the native metal, and the white mercurous chloride, calomel."