What does gneiss mean?
A type of metamorphic rock that is composed of multiple layers of different minerals, typically foliated and banded in appearance. Gneiss is formed when mica-rich rocks are subjected to high pressure and temperature.
Example
"The geologist studied the unique patterns of gneiss in the mountain range."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.