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Realgar ( / riˈælɡɑːr, - ɡər / ree-AL-gar, -gər ), also known as ″ arsenic blende ″, ″ ruby sulphur ″ or ″ ruby of arsenic ″, is an arsenic sulfide mineral with the chemical formula α - As4S4.
Arsenic sulfide | As2S3 | CID 61569 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
Apr 20, 2024 · Arsenious oxide, commonly known as white arsenic, is obtained as a by-product from the roasting of the ores of copper, lead, and certain other metals as well as by the roasting of arsenopyrite and arsenic sulfide ores. Arsenious oxide provides the starting material for most other arsenic compounds.
- The Editors of Encyclopaedia Britannica
Arsenic sulfides occurring in nature are realgar, As4 S 4; orpiment, As 2 S 3; arsenopyrite, FeAsS; and enargite, Cu 3 AsS 4. Realgar can be distilled without decomposition while orpiment melts at 310 °C and boils at 707 °C without decomposition.
Arsenic sulfide may refer to: Arsenic trisulfide, As 2 S 3, the mineral orpiment. Arsenic pentasulfide, As 2 S 5, similar structure to phosphorus pentasulfide (β-P 2 S 5) Tetraarsenic tetrasulfide, As 4 S 4 (2 isomers): the mineral realgar. the mineral pararealgar.
What is Realgar? Realgar is a monoclinic arsenic sulfide mineral with a brilliant red color and a chemical composition of As 4 S 4. Well-formed realgar crystals can look so much like red gemstones that the mineral was often called "ruby sulfur" and "ruby arsenic."
Realgar (tetraarsenic tetrasulfide) and orpiment (arsenic trisulfide) are naturally occurring sulfides of arsenic. 765 In one form or another, arsenic is present in rocks, 603 in soils, 307 in water, 435 and in living organisms 92 in concentrations of parts per billion to parts per million.
