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realgar

[ree-al-ger, -gahr] /riˈæl gər, -gɑr/
noun
1.
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.
Origin
1350-1400
1350-1400; Middle English < Medieval Latin realgerArabic rahj al-ghār powder of the mine or cave
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for realgar

realgar

/rɪˈælɡə/
noun
1.
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
Word Origin
C14: via Medieval Latin from Arabic rahj al-ghar powder of the mine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for realgar

an important ore of arsenic, a red or orange mineral containing both arsenic and sulfur. Typically it is a minor constituent of ore veins in association with orpiment (into which it disintegrates on long exposure to light). Realgar has been used by the Chinese for carvings, but these also deteriorate under light. It forms prismatic crystals of monoclinic symmetry. For detailed physical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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