Mineral Information and Data:

Cinnabar
HgS [CNMNC approved formula]

Named from the Persian "zinjifrah"; original meaning lost (dragon's blood?).

IMA status : Valid species (Pre-IMA 800) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.08.14.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.08) where Am Bn Xp, with (m+n):p=1:1
  (02.08.14)
  
Nickel-Strunz
(10th edition) :
02.CD.15a
  (02) Sulfides
  (02.C) Metal Sulfides, M:S = 1:1 (and similar)
  (02.CD) With Sn, Pb, Hg, etc.
  
Crystal system: Trigonal System
Point group (H-M): 32 — trapezoidal
Unit cell: a = 4.15 Ǻ, c = 9.50 Ǻ
Crystal Habit: Crystals rhombohedral to thick tabular, stout to slender prismatic; crystalline crusts, powdery coatings
Twinning: Common on {0001}, contact; also about [1000] axis
  
Color: Scarlet, brownish red, brown, black, lead-gray
Diaphaneity: Transparent, Translucent
Luster: Adamantine, inclining to metallic when dark; dull in friable material
Hardness (Mohs): 2 to 2.5
Measured Density: 8.09 g/cm3
Cleavage: 1; {10-10} perfect
Tenacity: Slightly sectile
Fracture: Subconchoidal, uneven
Streak: Scarlet to reddish brown
  
Polymorphism and Series: Trimorphous with metacinnabar and hypercinnabar
Geologic Setting: Formed from low-temperature hydrothermal solutions in veins, and in sedimentary, igneous, and metamorphic host rocks.
Mineral Association: Mercury, realgar, pyrite, marcasite, stibnite, “opal”, “chalcedony”, barite, dolomite, calcite
Ore deposits: The main ore for mercury.
  
Synonyms/varieties: Cinnabarite (of Dana), Llimpi, Vermeil
Other Properties: Gemstone Rare.
Comments: Chemistry is essentially pure HgS.

 

Cinnabar
Cinnabar on dolomite
Origin: Fenghuang, Hunan Province, China
Sample size: 7.5 x 3.5 x 4 cm
Photo: Dan Weinrich

 

Cinnabar
(zoom-in of above)

 

Cinnabar
Origin: Chatian, Hunan Province, China
Sample size: 4.3 x 4.1 x 3.0 cm
Photo: John Veevaert, Trinity Mineral Co

 

Cinnabar
(zoom-in of above)

 

Cinnabar
Origin: Culver Bear Mine, Sonoma Co., California, United States
Sample size: 5.5 x 3 x 2.5 cm (bottom)
Photo: Tom Loomis

 

Cinnabar
(zoom-in of above)

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