Definition of gneiss in English:

gneiss

Pronunciation /nīs/ /naɪs/

Translate gneiss into Spanish

noun

  • A metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mica.

    ‘Corundum occurs as an accessory mineral in some metamorphic rocks, such as mica schist, gneiss, and crystalline limestone.’
    • ‘Between the Dharwas leucogranite and Kilar there is a simple planar structure of interspersed pelitic gneiss and leucogranite bands with a regional foliation dipping to the south or southeast.’
    • ‘The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite.’
    • ‘The sample is weakly banded amphibolite-facies gneiss consisting of quartz, plagioclase, biotite and hornblende.’
    • ‘Quarzitic gneiss, low-grade metamorphic basic rocks, phyllites and dark chert can be abundant in some layers.’

Origin

Mid 18th century from German, from Old High German gneisto ‘spark’ (because of the rock's sheen).