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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
 
The densely populated Piedmont province, with its 500-million-year-old rock, and the Highlands province, with billion-year-old granites and gneisses, generate the most radon, especially where glacial deposits do not cover the bedrock, the team reports.
Eastern radon ranked by region by Pennisi, Elizabeth / Science News
The gemstones are closely related to the contact between mafic schists and felsic gneisses and pegmatites.
Douglas Lake Minerals Completes Negotiations to Acquire Tanzanian ... by Business Wire
Okanagan BC Brown & Dark Brown Proterozoic to Cenozoic Chernozems; Eutric granite gneisses.
Geology and wine 9: regional trace element fingerprinting of Canadian ... by Fryer, Brian J. / Geoscience Canada
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