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Identification
Color
Grayish black
Crystal habit
Massive, rarely as tetrahedral crystals, as incrustations
Twinning
Common as lamellae on {111}
Cleavage
None
Fracture
Subconchoidal
Tenacity
Brittle
Mohs scale hardness
3
Luster
Metallic
Streak
Black
Diaphaneity
Opaque
Specific gravity
7.7–7.8
References
[2][3][4]
Metacinnabar is the cubic form of mercury sulfide (HgS). It is the high temperature form and trimorphous with cinnabar (trigonal structure) and the higher temperature hypercinnabar (hexagonal structure). It occurs with cinnabar in mercury deposits and is associated with native mercury, wurtzite, stibnite, marcasite, realgar, calcite, barite,
chalcedony and hydrocarbons.[2]
It was first described in 1870 for an occurrence in the Redington mine, Knoxville, Napa County, California.[3][4]
Metacinnabar is the cubic form of mercury sulfide (HgS). It is the high temperature form and trimorphous with cinnabar (trigonal structure) and the higher...
separations). In addition, HgS is found in a black, non-cinnabar polymorph (metacinnabar) that has the zincblende structure. Cinnabar generally occurs as a vein-filling...
optically active. This is caused by the Hg-S helices in the structure. black metacinnabar (β-HgS) is less common in nature and adopts the zinc blende crystal structure...
considered a low-temperature hydrothermal mineral which occurs with metacinnabar, cinnabar, mercurian silver, tetrahedrite–tennantite, pyrite, sphalerite...
sphalerite group, consisting of sphalerite, colaradoite, hawleyite, metacinnabar, stilleite and tiemannite. The structure is closely related to the structure...
ore in the 19th century and the mid-1940s. A rare dimorph of cinnabar, metacinnabar, has also been reported in the Ivanhoe district. Gold mining started...
amorphous organic material, calcite, barite, quartz, cinnabar, and metacinnabar. It has also been reported in the Presov Region of the Slovak Republic...
there was a black, submetallic, sectile mineral first believed to be metacinnabar, but it was later proved to be a molybdenum compound. It was obvious...
in rough order of abundance, are cinnabar, mercury, edgarbaileyite, metacinnabar, montroydite, eglestonite, calomel, an unidentified yellow massive cryptocrystalline...
painted on wood). Similarly, cinnabar red has occasionally turned into metacinnabar. In addition, organic pigments such as brazilin have faded because of...
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