enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Cinnabar - Wikipedia

    en.wikipedia.org/wiki/Cinnabar

    Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1. The color and properties derive from a structure that is a hexagonal crystalline lattice belonging to the trigonal crystal system , crystals that sometimes exhibit twinning .

  3. Mercury sulfide - Wikipedia

    en.wikipedia.org/wiki/Mercury_sulfide

    red cinnabar (α-HgS, trigonal, hP6, P3221) is the form in which mercury is most commonly found in nature. Cinnabar has rhombohedral crystal system. Crystals of red are optically active. This is caused by the Hg-S helices in the structure. [5] black metacinnabar (β-HgS) is less common in nature and adopts the zinc blende crystal structure (T 2 ...

  4. Vermilion - Wikipedia

    en.wikipedia.org/wiki/Vermilion

    [2] The name originated because it had a similar color to the natural red dye made from an insect, Kermes vermilio, which was widely used in Europe. [2] [3] The first recorded use of "vermilion" as a color name in English was in 1289. [4] [5] The term cinnabar is used in mineralogy and crystallography for the red crystalline form of mercury ...

  5. Red pigments - Wikipedia

    en.wikipedia.org/wiki/Red_pigments

    The bright scarlet color, vermilion, was made by pulverizing the mineral cinnabar. A synthetic Vermilion was created in the 9th century with a compound of mercury and sulfur. century, with a mixture of the great majority of red pigments are made artificially, rather than taken from nature. [2]

  6. Edoylerite - Wikipedia

    en.wikipedia.org/wiki/Edoylerite

    This silica-carbonate rock was mineralized by cinnabar following the hydrothermal alteration of the serpentinite in the rock. Edoylerite is a primary alteration product of cinnabar. Though found with cinnabar, the crystals of edoylerite do not typically exceed 0.5mm in length. The ideal chemical formula for edoylerite is Hg 3 2+ Cr 6+ O 4 S 2 [2]

  7. Cleusonite - Wikipedia

    en.wikipedia.org/wiki/Cleusonite

    1 Composition. 2 Structure. ... {BC 2 D 6 E 12}O 38 which are characterized by their predominant cations ... pyrite, magnetite, cinnabar, and malachite.

  8. Mercury(II) oxide - Wikipedia

    en.wikipedia.org/wiki/Mercury(II)_oxide

    Under atmospheric pressure mercuric oxide has two crystalline forms: one is called montroydite (orthorhombic, 2/m 2/m 2/m, Pnma), and the second is analogous to the sulfide mineral cinnabar (hexagonal, hP6, P3221); both are characterized by Hg-O chains. [10] At pressures above 10 GPa both structures convert to a tetragonal form. [1]

  9. Kenhsuite - Wikipedia

    en.wikipedia.org/wiki/Kenhsuite

    The mineral is originally colorless or white in color, but is most often tinged with orange or red due to the presence of associated cinnabar. Prolonged exposure to light causes their darkening. The mercury sulfide chloride with the composition of kenhsuite is known in three polymorphic forms. [4]