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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 trisulfide is the inorganic compound with the formula As 2 S 3.It is a dark yellow solid that is insoluble in water. It also occurs as the mineral orpiment (Latin: auripigmentum), which has been used as a pigment called King's yellow.
Naples yellow/cassel yellow – oxychloride of lead, formed by heating litharge with sal ammoniac. Mercurius praecipitatus – red mercuric oxide. Mosaic gold – stannic sulfide, formed by heating a mixture of tin filings, sulfur, and sal-ammoniac. Orpiment – arsenic trisulfide, an ore of arsenic. Pearl white – bismuth nitrate, BiNO 3
After a long period of exposure to light, realgar changes form to a yellow powder known as pararealgar (β-As 4 S 4). It was once thought that this powder was the yellow sulfide orpiment, but is a distinct chemical compound. [16]
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
Naples yellow is a saturated yellow, occasionally with pink or off-white hues. [8] It has a strong hiding power and effectively covers other pigments. [8] Temperature during production affects its hue. A more vibrant lemon-yellow is produced at higher temperatures, whereas an orange-yellow is produced at lower temperatures.
Red Getchellite and yellow Orpiment from the Getchell Mine, the type locality.. Getchellite is a rare sulfide of arsenic and antimony, AsSbS 3, that was discovered by B. G. Weissberg of the New Zealand Department of Scientific and Industrial Research in 1963, and approved as a new species by the International Mineralogical Association in 1965.
This unstable allotrope, being molecular, is the most volatile, least dense, and most toxic. Solid yellow arsenic is produced by rapid cooling of arsenic vapor, As 4. It is rapidly transformed into grey arsenic by light. The yellow form has a density of 1.97 g/cm 3. [23] Black arsenic is similar in structure to black phosphorus. [23]
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