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gneiss

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
gneiss  (ns)
n.
A banded or foliated metamorphic rock, usually of the same composition as granite.
[German Gneis, probably alteration of Middle High German ganeist, spark (from its appearance), from Old High German gneista.]
gneissic (nsk), gneissoid (nsoid), gneissose (nss) adj.
gneiss
Noun
a coarse-grained layered metamorphic rock [German Gneis]
gneiss  (ns)
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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.gneiss - a laminated metamorphic rock similar to granite
metamorphic rock - rock altered by pressure and heat
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Field evidence for this ancient crust is limited to a few remnants of supracrustal and plutonic rocks preserved in the Nuvvuagittuq belt and rare enclaves of tonalitic gneiss.
Government geoscience stimulates mineral exploration in the superior ... by Simard, Martin / Geoscience Canada
It includes bedded limestone, dolomite, shale, slate, sandstone, marble, flagstone banded gneiss, massive white to red granite and black anorthsite.
Ontario stone offers untapped potential, says industry official by Brown, Stewart / Northern Ontario Business
All of the remaining samples were comprised of variations of the bulk host lithology of garnetiferrous, biotitic gneiss.
Douglas Lake Minerals Strikes Visible Gold in High Grade Vein ... by Business Wire
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