metacinnabar


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metacinnabar

[‚med·ə′sin·ə‚bär]
(mineralogy)
HgS A black isometric mineral that represents an ore of mercury. Also known as metacinnabarite.
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Hg occurs in nature in mineral, cinnabar, metacinnabar and hypercinnabar.
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).
Other mercury-bearing minerals identified from the mineralized veins include montroydite, schuetteite, calomel, gianellaite, mosesite, terlinguaite, eglestonite, metacinnabar, cinnabar, native mercury and the second world occurrence of donharrisite.
Black coatings of metacinnabar, some of it selenian, have been identified at the lower workings by XRD where it is associated with cinnabar.
The characteristic minerals of the mercury deposits include cinnabar, dolomite, quartz, calcite, pyrite, sphalerite, metacinnabar, barite, realgar, orpiment, stibnite and "asphalt.
Occurrence: In fractures in the Jackfork sandstone with cinnabar, quartz and dickite and other mercury minerals (calomel, eglestonite, mercury, metacinnabar, montroydite, terlinguaite).
The description of cinnabar mentions the relationship with metacinnabar and hypercinnabar; the description of hypercinnabar mentions the relationship with cinnabar and metacinnabar; but the description of metacinnabar mentions only the relationship with cinnabar.
Associated mercury-bearing minerals are: cinnabar, metacinnabar and native mercury.