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Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi dictionary thesaurus
Gneiss. Gneiss is a very widespread rock type, especially in the lower parts of the continental crust but it is also a common rock on the surface in some places (Scandinavia, Canada, and other shield areas where crystalline rocks are not covered by a layer of sedimentary rocks).ost of the mineral grains of gneissose rocks are visible to the naked eye. Banding in gneiss is a result of mineral segregation into separate, typically light-and dark-colored layers. Light-colored layer is usually composed of feldspars and quartz.