Definitions

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

  • n. A rock formed from the metamorphism of quartz sandstone.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a metamorphic rock consisting of interlocking grains of quartz

from the GNU version of the Collaborative International Dictionary of English

  • n. Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.

from The Century Dictionary and Cyclopedia

  • n. A rock composed essentially of the mineral quartz.

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

  • n. hard metamorphic rock consisting essentially of interlocking quartz crystals

Etymologies

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