Mercury Sulfide (HgS)-Granules introduce:
Mercury sulfide, mercuric sulfide, mercury sulphide, or mercury(II) sulfide is a chemical compound composed of the chemical elements mercury and sulfur.
Molar mass：232.66 g/mol
Melting point：580 °C (1,076 °F; 853 K) decomposes
Solubility in water：insoluble
Band gap：2.1 eV (direct, α-HgS)
Magnetic susceptibility (χ)：−55.4·10−6 cm3/mol
Refractive index (nD)：w=2.905, e=3.256, bire=0.3510 (α-HgS)
When α-HgS is used as a red pigment, it is known as vermilion. The tendency of vermilion to darken has been ascribed to conversion from red α-HgS to black β-HgS. However β-HgS was not detected at excavations in Pompeii, where originally red walls darkened, and was attributed to the formation of Hg-Cl compounds (e.g., corderoite, calomel, and terlinguaite) and calcium sulfate, gypsum.
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