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Realgar (/ r i ˈ æ l ɡ ɑːr,-ɡ ər / 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-As 4 S 4. It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related ...
Arsenic blende or Arsenblende (German: Arsenblende, arsenik-blende) is a trivial name that has partially fallen out of scientific use, used by mineralogists, as well as representatives of mining and craft professions in relation to at least two similar ore minerals — orpiment and realgar, [1]: 135, 239, 438 in composition — arsenic sulfides.
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; Tetraarsenic trisulfide, As 4 S 3, the mineral α- or β- dimorphite
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Pararealgar is an arsenic sulfide mineral with the chemical formula As 4 S 4, [3] also represented as AsS. [5] It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, As 4 S 4.
When they analyzed a mineral during seafloor sampling consisting of red and orange arsenic sulfides by X-ray diffraction, a mixture of realgar and alacranite was resulted and it was noticed that the mineral was identical to synthetic β-As 4 S 4 supposed that the original chemical formula of alacranite (As 8 S 9) was incorrect. [6]
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Realgar wine can be bought ready-made, but it is often prepared from homemade yellow wine and realgar mineral powder bought from drugstores, markets, or street vendors. [citation needed] A typical recipe calls for 50 to 100 grams of realgar powder to be added to one liter of homemade wine and left to stand at room temperature for several hours ...