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gneiss

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gneiss

Coarse-grained metamorphic rock, formed under conditions of high temperature and pressure, and often occurring in association with schists and granites. It has a foliated, or layered, structure consisting of thin bands of micas and/or amphiboles dark in colour alternating with bands of granular quartz and feldspar that are light in colour. Gneisses are formed during regional metamorphism; paragneisses are derived from metamorphism of sedimentary rocks and orthogneisses from metamorphism of granite or similar igneous rocks.



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? Mentioned in ? References in periodicals archive
 
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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