Concept information
Preferred term
gneiss
Definition
- Gneiss is a common and widely distributed type of metamorphic rock. Gneiss is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. 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. (Adapted from: https://en.wikipedia.org/wiki/Gneiss)
Broader concept
Synonym(s)
- gneisses
In other languages
-
French
URI
http://data.loterre.fr/ark:/67375/QX8-TCTMWRN4-H
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