Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pararealgar is an arsenic sulfide material with the chemical formula AsS. It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, As4S4. It is soft with a Mohs hardness of 1 - 1.5, is yellow orange in colour, and its monoclinic or prismatic crystals are very brittle, easily crumbling to powder.A sulfide (sulphide in British English) is an anion of sulfur in its lowest oxidation number of –2. Sulfide is also a slightly archaic term for thioethers, a common type of organosulfur compound that are well known for their bad odors.

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