Hg occurs in nature in mineral, cinnabar, metacinnabar
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.
Or alternatively, it may be mercury lost prior to formation of the metacinnabar through various types of exposures," said George.
1997), using electron microscopy techniques, identified metacinnabar in Hg-contaminated floodplain sediments near Oak Ridge, TN.
Analysis of the patterns indicates that the HgS is crystalline with a structure consistent with metacinnabar (HgS).
Similar to metacinnabar, these grains are thought to have formed in situ within the sediment.