Definitions

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

  • noun A natural beryllium silicate, Be2SiO4, occurring as vitreous crystals sometimes used as gems.

from The Century Dictionary.

  • noun A rare mineral occurring in transparent rhombohedral crystals, colorless to wine-yellow, and having a vitreous luster.

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

  • noun (Min.) A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.

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

  • noun mineralogy A clear glassy mineral, a silicate of glucina, occurring in rhombohedral crystals and sometimes used as a gem.

Etymologies

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

[Greek phenāx, phenāk-, impostor + –ite.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek impostor, deceiver, because of its resemblance to quartz.

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