red orpiment

noun Mineralogy. Unabridged


[ree-al-ger, -gahr]
arsenic disulfide, As 2 S 2 , found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics.
Also called red orpiment.

1350–1400; Middle English < Medieval Latin realgerArabic rahj al-ghār powder of the mine or cave Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
realgar (rɪˈælɡə)
a rare orange-red soft mineral consisting of arsenic sulphide in monoclinic crystalline form. It occurs in Utah and Romania and as a deposit from hot springs. It is an important ore of arsenic and is also used as a pigment. Formula: AsS
[C14: via Medieval Latin from Arabic rahj al-ghar powder of the mine]

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