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orpiment

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Orpiment
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or⋅pi⋅ment

  [awr-puh-muhnt]
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–noun
a mineral, arsenic trisulfide, As2S3, found usually in soft, yellow, foliated masses, used as a pigment.
Origin:
1350–1400; ME < OF < L auripigmentum pigment of gold; see auri- 1 , pigment
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Orpiment
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or·pi·ment   (ôr'pə-mənt)   
n.  Arsenic trisulfide, As2S3, a yellow mineral used as a pigment.

[Middle English, from Old French, from Latin auripigmentum : aurum, gold + pigmentum, pigment; see pigment.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

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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