Realgar definition

rē-ălgär, -gər
A soft orange-red arsenic ore, As2 S2 , used in pyrotechnics and tanning and as a pigment.
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A bright orange-red, monoclinic mineral, AsS, used in fireworks, paints, etc.; arsenic sulfide.
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(mineralogy) A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.
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Other Word Forms

Noun

Singular:
realgar
Plural:
realgars

Origin of realgar

  • Middle English from Medieval Latin from Catalan from Arabic rahj al-ġār powder (of) the mine or cave rahj powder al- the ġār cave ġrr in Semitic roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Old English, from Medieval Latin, from Arabic رهج الغار (rahj-al-ğār, “cave dust”).

    From Wiktionary

Realgar Sentence Examples

  • Arsenic, in its well-known and beautiful forms, orpiment and realgar, is found in New South Wales and Victoria.

  • Cinnabar, realgar, orpiment and coal form the rest of the mineral products of Kwei-chow.

  • Arsenic is a constituent of the minerals arsenical iron, arsenical pyrites or mispickel, tin-white cobalt or smaltite, arsenical nickel, realgar, orpiment, pharmacolite and cobalt bloom, whilst it is also met with in small quantities in nearly all specimens of iron pyrites.

  • There are three known compounds of arsenic and sulphur, namely, realgar As2S2, orpiment As2S3, and arsenic pentasulphide As2S5.

  • Realgar occurs native in orange prisms of specific gravity 3.5; it is prepared artificially by fusing together arsenic and sulphur, but the resulting products vary somewhat in composition; it is readily fusible and sublimes unchanged, and burns on heating in a current of oxygen, forming arsenic trioxide and sulphur dioxide.

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Words near realgar in the Dictionary