from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A isometric-hextetrahedral form of the mineral, cinnabar, containing mercury and sulfur and ranging from black to grayish white.
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.
Or alternatively, it may be mercury lost prior to formation of the metacinnabar through various types of exposures, "said George.
"Possibly this missing mercury is in the less toxic form of mercury (metacinnabar) abraded from the surface of the filling.