Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An opaque or semitranslucent brown glass flecked with small metallic particles, often of copper or chromic oxide.
  • noun Any of several varieties of quartz or feldspar flecked with particles of mica, hematite, or other materials.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental (par aventure) dropping of some brass filings into a pot of melted glass.
  • noun (Min.) A variety of translucent quartz, spangled throughout with scales of yellow mica.
  • noun a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental (par aventure) dropping of some brass filings into a pot of melted glass.
  • noun mineralogy A variety of translucent quartz, spangled throughout with scales of yellow mica.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a translucent quartz spangled with bits of mica or other minerals

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French, from aventure, accident (so called because of its accidental discovery or the randomness of inclusions in it); see adventure.]

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