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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 .
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 ...
[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 sulfide HgS. Thus, the natural mineral pigment is called "cinnabar", and its synthetic form is called "vermilion" from red lead. [2]
The sulphide minerals are a class of minerals containing sulphide (S 2−) or disulphide (S 2− 2) as the major anion. Some sulfide minerals are economically important as metal ores . The sulphide class also includes the selenides , the tellurides , the arsenides , the antimonides , the bismuthinides, the sulpharsenides and the sulphosalts .
[2] The ancient Chinese believed that ingesting long-lasting mineral substances such as jade , cinnabar , or hematite would confer some of that longevity on the person who consumed them. [ 3 ] Gold was considered particularly potent, as it was a non-tarnishing precious metal; the idea of potable or drinkable gold is found in China by the end of ...
Crystals of cinnabar, crystals of barite, crystals of quartz, crystals of calcite : Wanshan Mine, Wanshan District, Tongren Prefecture, Guizhou Province, China, an example of material historically associated with Chinese alchemy. Chinese alchemy (煉丹術 liàndānshù "method for refining cinnabar") is a historical Chinese approach to alchemy.
A research question is "a question that a research project sets out to answer". [1] Choosing a research question is an essential element of both quantitative and qualitative research . Investigation will require data collection and analysis, and the methodology for this will vary widely.
Triboluminescence of nicotine L-salicylate. Triboluminescence is a phenomenon in which light is generated when a material is mechanically pulled apart, ripped, scratched, crushed, or rubbed (see tribology).