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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 type of metamorphic rock that forms when a sedimentary or igneous rock is exposed to extreme temperatures and pressure. When this happens, virtually no traces of the original rock remain. Gneiss rocks are characterized by their arrangement of minerals into long bands. Interesting Gneiss Facts: Gneiss is distinctive among other rocks that have bands because its minerals are not evenly distributed so the bands are various widths. Under appropriate conditions, gneiss can be recrystallized into granite. There is gneiss in Canada that date back 4 billion years.