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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 high metamorphic grade of foliated rock composed from granite, schist or other types of rock. It is coarse-grained rock with bands which alternate dark and light. The banded patterns sometimes swirl as if the rock had been folded. This rock is durable and is widely used as building rock.oliated metamorphic rocks are slate, schist, phyllite and gneiss. The properties of these rocks make them useful in industry and design. When you have a project that you are thinking about using rock to complete, you may want to consider using foliated metamorphic rock.