Gneiss

ahd-5
  • noun. A banded or foliated metamorphic rock, usually of the same composition as granite.
    • The Century Dictionary and Cyclopedia
  • noun. A rock which consists essentially of the same mineral elements as granite, namely orthoclase, quartz, and mica, but in which there is a more or less distinctly foliated arrangement of the constituent minerals, and especially of the mica.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic gneiss or syenitic gneiss. Similar varieties of related rocks are also called gneiss.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. A common and widely-distributed metamorphic rock having bands or veins, but not schistose.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. a laminated metamorphic rock similar to granite
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