Cinnabar

From Academic Kids

Cinnabar
Missing image
CinnabarUSGOV.jpg
Cinnabar
General
CategoryMineral
Chemical formula mercury(II) sulfide, HgS
Identification
Colour Brownish-red
Crystal habit Rhombohedral to tabular. Granular to massive
Crystal system Hexagonal
Cleavage Prismatic, perfect
Fracture Uneven to subconchoidal
Mohs Scale hardness 2-2.5
Luster Adamantine to dull
Refractive index Transparent to opaque
Pleochroism N/A
Streak Scarlet
Specific gravity 8 - 8.2
Fusibility ?
Solubility 10-6 g per 100 ml water1
Major varieties
None

Cinnabar (German Zinnober), sometimes written cinnabarite, is a name applied to red mercury(II) sulfide (HgS), or native vermilion, the common ore of mercury. The name comes from the Greek, used by Theophrastus, and was probably applied to several distinct substances. Other sources say the word comes from the Persian zinjifrah, originally meaning "lost".

Cinnabar was mined by the Roman Empire for its mercury content and it has been the main ore of mercury throughout the centuries. Some mines used by the Romans are still being mined today. It is generally found as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs.

Cinnabar is generally found in a massive, granular or earthy form, and is bright scarlet to brick red in color. However, it occasionally occurs in crystals with a metallic adamantine luster. The crystals belong to the rhombohedral (trigonal) system, and are generally of rhombohedral habit, sometimes twinned. The twinning in cinnabar is distinctive and forms a penetration twin that is ridged with six ridges surrounding the point of a pryamid. It could be thought of as two scalahedral crystals grown together with one crystal going the opposite way of the other crystal.

Cinnabar presents remarkable resemblance to quartz in its symmetry and optical characteristics. Like quartz, it exhibits circular polarization, and Alfred Des Cloizeaux showed that it possessed fifteen times the rotatory power of quartz. It has higher refractive power than any other known mineral, its mean index for sodium light being 3 ~O2, while the index for diamond -- a substance of remarkable refraction -- is only 2~42. The hardness of cinnabar is 2 - 2.5, and its specific gravity 8.998.

Cinnabar is found in all localities which yield mercury, notably Almaden (Spain), New Almaden (California), Idrija (Slovenia), Landsberg, near Ober-Moschel in the Palatinate, Ripa, at the foot of the Apuan Alps (Tuscany), the mountain Avala (Serbia), Huancavelica (Peru), and the province of Kweichow in China, where very fine crystals have been obtained. Cinnabar is still being deposited at the present day from the hot waters of Sulphur Bank, in California, and Steamboat Springs, Nevada.

Missing image
Cinnabar_China.jpg
Cinnabar crystals on Dolomite from China.

Hepatic cinnabar is an impure variety from Idrija in Carniola, in which the cinnabar is mixed with bituminous and earthy matter.

Metacinnabarite is a cubic form of mercury(II) sulfide, this compound being dimorphous.

Of note

Cinnabar may be associated with elemental (liquid) mercury and thus be dangerous to handle. Body temperature is often enough to vaporize the mercury out of the rock and this gas can be absorbed through the skin.


References

Note 1: Weast, R.C. (1973) Handbook of Chemistry and Physics. CRC Press, Cleveland, OH.

See also


The Cinnabar is also a Moth, Tyria jacobaeae.de:Zinnober es:Cinabrio fr:Cinabre nl:Vermiljoen pl:cynober sk:Rumelka zh:朱砂

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