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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 .
Cinnabar has been used in Traditional Chinese medicine as a sedative for more than 2000 years, and has been shown to have sedative and toxic effects in mice. [111] In addition to being used for insomnia, cinnabar is thought to be effective for cold sores, sore throat, and some skin infections. [112]
The turmeric powder becomes red when mixed with lime juice or lime powder. [4] Unlike red lead and vermilion, these are not poisonous. [4] [5] Modern material being sold as sindoor mainly uses vermilion, an orange-red pigment, the purified and powdered form of cinnabar, which is the chief form in which mercury sulfide naturally occurs. As with ...
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In 1835, "Chinese vermilion" was described as a cinnabar so pure that it only had to be ground into powder to become a perfect vermilion. Historically, European vermilion often included adulterants including brick, orpiment , iron oxide , Persian red , iodine scarlet —and minium (red lead), an inexpensive and bright, but fugitive lead-oxide ...
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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 ...
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