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| Cinnabar
is named from the Medieval
Latin cinnabaris, traceable to the Persian zinjifrah,
apparently meaning dragon’s blood, for the red color.
| Discovered
around 800 AD;
IMA
status:
Valid (pre-IMA; Grandfathered) |
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Composition: |
Mercury |
86.22 % |
Hg |
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Sulfur |
13.78 % |
S |
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100.00 % |
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Classification
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Mineral
Classification: |
Sulfides
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Strunz 8th
Ed. ID:
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2/C.18-10
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Nickel-Strunz 10th
Ed. ID:
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2.CD.15
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2 : SULFIDES and SULFOSALTS (sulfides, selenides,
tellurides; arsenides, antimonides, bismuthides; sulfarsenites,
sulfantimonites, sulfbismuthites, etc.) C : Metal Sulfides, M: S = 1: 1 (and similar)
D : With Sn, Pb, Hg, etc.
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Related
to: |
Trimorphous with Metacinnabar and Hypercinnabar
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Varieties: |
Corallinerz
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Synonyms: |
Cinnabarite (of Dana),
Llimpi, Merkurblende, Minium (of Pliny), Vermeil
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Crystal
Data
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Crystallography:
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Trigonal
- Trapezohedral |
Crystal
Habit:
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Rhombohedral
crystals, to 10 cm; thick tabular {0001}; stout to slender
prismatic || [1010]. Also as incrustations, granular,
and massive.
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Twinning:
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Twin
plane {0001}, twin axis [0001], to form simple contact
twins.
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Physical
Properties
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Cleavage: |
Perfect
on {1010}
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Fracture: |
Sub-Conchoidal,
Irregular/Uneven
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Tenacity:
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Slightly Sectile
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Moh's
Hardness: |
2.0
- 2.5
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VHN
Hardness: |
82–156
(10 g load)
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Density:
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8.176
- 8.200 (g/cm3)
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Luminescence:
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Not
Fluorescent
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Radioactivity:
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Not
Radioactive
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Health
Warning: |
CAUTION:
Contains Mercury - always wash hands after handling. Do not inhale dust and use
caution when breaking. Do not lick or ingest. Do not heat in unventilated
environment - emits toxic Hg fumes. Mercury Sulfide is, however, relatively
insoluble and toxicity of the pure material is low. But be aware that many
samples of Cinnabar, especially those which are 'massive' rather than
crystalline, also contain traces of native mercury, and this is far more easily
absorbed by the body. |
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Optical
Properties
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Color: |
Vermilion
red, brownish red, lead gray
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Transparency: |
Transparent
to Translucent; Transparent in thin pieces
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Luster: |
Adamantine;
inclining
to metallic when dark; dull to earthy in massive varieties
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Refractive
Index: |
nω = 2.905; nε = 3.256 Uniaxial ( + ) R1–R2:
(400) 30.0–33.5, (420) 28.8–32.1, (440) 27.4–30.9, (460)
26.4–29.9, (480) 25.7–29.5, (500) 25.2–29.4, (520) 24.6–29.4,
(540) 24.2–29.1, (560) 23.9–28.6, (580) 23.7–27.9, (600)
23.4–27.3, (620) 23.0–26.8, (640) 22.6–26.3, (660) 22.4–26.0,
(680) 22.1–25.7, (700) 21.9–25.5
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Birefringence: |
0.351
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Dispersion: |
Strong;
over 0.40
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Pleochroism: |
None
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Anisotropism: |
High
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Occurances
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Geological
Setting: |
Formed
from low-temperature hydrothermal solutions in veins,
and in sedimentary, igneous, and metamorphic host rocks.
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Common
Associations: |
Mercury,
Realgar, Pyrite, Marcasite, Stibnite, Opal, Chalcedony,
Barite, Dolomite, Calcite |
Common
Impurities: |
None
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Type
Locality: |
Ancient;
probably
India |
Year
Discovered: |
Ancient;
around
800 AD |
View
mineral photos: |
Cinnabar
Mineral Photos and Locations |
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More
Information
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Mindat.org
Webmineral.com
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Cinnabar
is a beautiful mineral with intense color in varying shades
of red and with adamantine luster. Faceted gems are
very rare since Cinnabar is extemely soft and fragile.
Although Cinnabar is found at several
locations worldwide, the source of the world's finest
Cinnabar crystals is Hunan Province, China. The most common
use of Cinnabar has been in carved Chinese lacquerware, a technique that may
have originated in the Song Dynasty. It has been used
by the Chinese for centuries to make a red pigment which
is applied to carved objects similar to a lacquer.
In the modern jewelry industry, the toxic pigment is replaced by a resin-based polymer that approximates the appearance of the
pigmented lacquer. Cinnabar was also 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.
Because of its mercury
content, Cinnabar can be toxic to human beings. Overexposure to mercury, called
mercurialism, was considered by the ancient Romans as an occupational
disease for miners. Mining in the Spanish Cinnabar mines of Almadén
was regarded as being a death
sentence due to the shortened life expectancy of the miners, who were
slaves or convicts.
Distribution:
The most common ore of mercury world-wide, so only a
few localities for exceptionally abundant or well-crystallized
material can be mentioned. In the USA, in California,
notably at New Almaden, Santa Clara County and New Idria,
San Benito County; in Texas, at Terlingua, Brewster
County; in Nevada, at the Cahill mine, Poverty Peak
district, Humboldt County, and near Lovelock, Pershing
County At Charcas, San Luis Potosí, Mexico. In Spain,
from Almadén, Ciudad Real Province, and Mieres, Asturias.
At Hydercahn, in the Fergana basin, Kazakhstan. From
Tongrin, Wanshanchang, and elsewhere in Guizhou Province,
and in exceptional twinned crystals from the Tsar Tien
mine, Hunan Province, China. As fine crystals at Mount
Avala, near Belgrade, Serbia. From Idrija (Idria), Slovenia.
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Cinnabar
gems for sale:
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have not photographed our Cinnabar gems yet. Please
check back soon.
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