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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 ...
Orpiment, also known as ″yellow arsenic blende″ is a deep-colored, orange-yellow arsenic sulfide mineral with formula As 2 S 3.It is found in volcanic fumaroles, low-temperature hydrothermal veins, and hot springs and may be formed through sublimation.
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.
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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 )
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Arsenic may be solubilized by various processes. When pH is high, arsenic may be released from surface binding sites that lose their positive charge. When water level drops and sulfide minerals are exposed to air, arsenic trapped in sulfide minerals can be released into water. When organic carbon is present in water, bacteria are fed by ...