gneiss

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gneiss

gneiss , coarse-grained, imperfectly foliated, or layered, metamorphic rock . Gneiss is characterized by alternating light and dark bands differing in mineral composition and having coarser grains than those of schist. The light bands of gneiss are generally composed of quartz and feldspar . Hornblende, biotite mica, garnet, or graphite commonly form the dark bands. Gneisses result from the metamorphism of many igneous or sedimentary rocks, and are the most common types of rocks found in Precambrian regions. Gneiss is found in New England, the Piedmont, the Adirondacks, and the Rocky Mts. Some gneisses are used as facing stone on buildings.

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gneiss

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

gneiss Metamorphic rock with a distinctive layering or banding. The darker minerals are likely to be hornblende, augite, mica, or dark feldspar. Before metamorphism, gneiss was an igneous rock, possibly a granite.

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	Geological position and origin of augen gneisses from the Policka Unit, eastern Bohemian Massif Magazine article from: Journal of Geosciences; 4/1/2009; ; 700+ words ; ...migmatitic augen gneisses were affected by...geothermobarometry, augen gneiss, Policka Unit Received...plagioclase forms augen in gneiss of the diorite or...2009). Dark grey gneisses with oval feldspar...the Policka augen gneiss merits discussion...geochemistry of augen gneisses make ...
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