gneiss

[nahys]
noun
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.

Origin:
1750–60; < German

gneissic, adjective

gneiss, nice (see usage note at nice).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gneiss (naɪs)
 
n
any coarse-grained metamorphic rock that is banded and foliated: represents the last stage in the metamorphism of rocks before melting
 
[C18: from German Gneis, probably from Middle High German ganeist spark; related to Old Norse gneista to give off sparks]
 
'gneissic
 
adj
 
'gneissoid
 
adj
 
'gneissose
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

gneiss
1757, from Ger. Gneiss "type of metamorphic rock," from M.H.G. gneist "spark" (so called because the rock glitters), from O.H.G. gneisto "spark."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
gneiss   (nīs)  Pronunciation Key 
A highly foliated, coarse-grained metamorphic rock consisting of light-colored layers, usually of quartz and feldspar, alternating with dark-colored layers of other minerals, usually hornblende and biotite. Individual grains are often visible between layers. Gneiss forms as the result of the regional metamorphism of igneous, sedimentary, or other metamorphic rocks.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If you go down to see them, you will find some with the gneiss attached to the quartz.
Gneiss resembles schist, except that the minerals are arranged into bands.
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