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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 (pronounced 'nice') is a globally common type of metamorphic rock that can easily be identified by its alternating layers of minerals known as gneissic banding. It forms as a result of high-grade, regional metamorphism.esson Summary. Gneiss is a high-grade, metamorphic rock that forms as a result of regional metamorphism. It forms from quartz, feldspar, mica, and other clay mineral-rich rocks that are exposed to high temperature and high pressure metamorphic conditions.