Chemistry:Metacinnabar
From HandWiki
Short description: Cubic form of mercury sulfide
| Metacinnabar | |
|---|---|
 | |
| General | |
| Category | Sulfide mineral |
| Formula (repeating unit) | HgS |
| Strunz classification | 2.CB.05a |
| Crystal system | Cubic |
| Crystal class | Hextetrahedral (43m) H-M symbol: (4 3m) |
| Space group | F43m |
| Unit cell | a = 5.8717(5) Å; Z = 4 |
| Structure | |
| Jmol (3D) | Interactive image |
| 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 |
| |re|er}} | Metallic |
| Streak | Black |
| Diaphaneity | Opaque |
| Specific gravity | 7.7–7.8 |
| References | [1][2][3] |
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.[1]
It was first described in 1870 for an occurrence in the Redington mine, Knoxville, Napa County, California.[2][3]
References
- ↑ 1.0 1.1 Metacinnabar in the Handbook of Mineralogy
- ↑ 2.0 2.1 Metacinnabar on Mindat.org
- ↑ 3.0 3.1 Metacinnabar data on Webmineral
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
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