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Mercury sulfide : ウィキペディア英語版
Mercury sulfide

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Mercury sulfide, mercuric sulfide, mercury sulphide, or mercury(II) sulfide is a chemical compound composed of the chemical elements mercury and sulfur. It is represented by the chemical formula HgS. It is virtually insoluble in water.
==Crystal structure==

HgS is dimorphic with two crystal forms:
*red cinnabar (α-HgS, hexagonal, hP6, P3221), is the form in which mercury is most commonly found in nature.
*black, metacinnabar (β-HgS), is less common in nature and adopts the zinc blende (''T''2d-''F'3m'') crystal structure.
Crystals of red, α-HgS, are optically active. This is caused by the Hg-S helices in the structure.〔


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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