Meaning of gneiss

gneiss

Pronunciation: (nīs), [key]
— n.
  1. a metamorphic rock, generally made up of bands that differ in color and composition, some bands being rich in feldspar and quartz, others rich in hornblende or mica.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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