Gneiss
Common high-grade metamorphic rock
Gneiss
Gneiss ( NYSE) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. This rock is formed under pressures ranging from 2 to 15 kbar, sometimes even more, and temperatures over 300 °C (572 °F). Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss.
Read on Wikipedia · Image No machine-readable author provided. Siim assumed (based on copyright claims)., CC BY-SA 3.0
Open boosters, collect cards and trade them. Free to play.
Play for free