orpiment

orpiment

[awr-puh-muhnt]
noun
a mineral, arsenic trisulfide, As 2 S 3 , found usually in soft, yellow, foliated masses, used as a pigment.

Origin:
1350–1400; Middle English < Old French < Latin auripigmentum pigment of gold; see auri-1, pigment

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orpiment (ˈɔːpɪmənt)
 
n
a yellow mineral consisting of arsenic trisulphide in monoclinic crystalline form occurring in association with realgar: it is an ore of arsenic. Formula: As2S3
 
[C14: via Old French from Latin auripigmentum gold pigment]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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orpiment

the transparent yellow mineral arsenic sulfide (As2S3), formed as a hot-springs deposit, an alteration product (especially from realgar), or as a low-temperature product in hydrothermal veins. It is found in Copalnic, Romania; Andreas-Berg, Ger.; Valais, Switz.; and Colemerik, Tur. The crystals belong to the monoclinic system. For detailed physical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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