Cinnabar

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Cinnabar
Cinnabarit 01.jpg
Cinnabar
General
Category Sulfide mineral
Formula
(repeating unit)
mercury(II) sulfide, HgS
Strunz classification 02.CD.15a
Crystal symmetry Trigonal Trapezohedral
H-M seembol: 3 2
Space group: P31 2 1
Unit cell a = 4.145(2) Å, c = 9.496(2) Å, Z=3
Identification
Color Cochineal-reid, towards brounish reid an lead-gray
Crystal habit Rhombohedral tae tabular; granular tae massive an as incrustations
Crystal seestem Trigonal
Twinnin Simple contact twins, twin plane {0001}
Cleavage Prismatic {1010}, perfect
Fractur Uneven tae subconchoidal
Tenacity Slichtly sectile
Mohs scale hairdness 2-2.5
Luster Adamantine to dull
Streak Scarlet
Diaphaneity Transparent in thin pieces
Specific gravity 8.176
Optical properties Uniaxial (+)
Refractive index nω = 2.905 nε = 3.256
Birefringence δ = 0.351
Solubility 1.04 x 10-25 g per 100 ml water (Ksp at 25°C = 2 x 10-32)[1]
References [2][3][4]

Cinnabar (pronoonced /ˈsɪnəbɑr/) or cinnabarite /sɪnəˈbɑrt/ (reid mercury(II) sulfide (HgS), native vermilion), is the common ore o mercur.

References[eedit | eedit soorce]

  1. Meyers, J. (1986). Chem. Ed. 63. p. 689. 
  2. Mineral Handbook
  3. Mindat
  4. Webmineral