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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The Ksp of cinnabar (4E - 53) is lower than that of metacinnabar (1.6E - 52), from which follows the fact that the occurrence of cinnabar in fumarolic incrustations is more plausible.
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.
"Possibly this missing mercury is in the less toxic form of mercury (metacinnabar) abraded from the surface of the filling.
(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.
The characteristic minerals of the mercury deposits include cinnabar, dolomite, quartz, calcite, pyrite, sphalerite, metacinnabar, barite, realgar, orpiment, stibnite and "asphalt." Cinnabar, dolomite, quartz and calcite crystals are predominant in most of the orebodies, the other minerals being rare, and some being visible only under the microscope.
Occurrence: In fractures in the Jackfork sandstone with cinnabar, quartz and dickite and other mercury minerals (calomel, eglestonite, mercury, metacinnabar, montroydite, terlinguaite).
(4) Them are three polymorphs of HgS: cinnabar, metacinnabar, and hypercinnabar.
Associated mercury-bearing minerals are: cinnabar, metacinnabar and native mercury.