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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
4. gneiss Gneiss is metamorphosed schist. It is a highly metamorphosed that is almost a granite. It differs from schist due to the lenses of feldspar between the mica layers. The minerals in gneiss may occur either as layers (foliation) or elongated in one direction (lineation).