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gneiss$32106$ - ترجمة إلى اليونانية
COMMON AND WIDELY DISTRIBUTED TYPE OF ROCK
Gneisses; Gneiß; Gneissose; Orthogneiss; Paragneiss; Gneis; Augen gneiss; Biotite gneiss; Granite gneiss; Gnejs; Gneissic banding; Compositional banding; Metamorphic differentiation; Gniess; Gneissic
![Sample of Sete Voltas gneiss from [[Bahia]] in Brazil, the oldest rock outcropping in the crust of South America, {{circa}} 3.4 billion years old (Archean)](https://commons.wikimedia.org/wiki/Special:FilePath/Gnaisse Sete Voltas - Bahia - Brasil.jpg?width=200 "Sample of Sete Voltas gneiss from [[Bahia]] in Brazil, the oldest rock outcropping in the crust of South America, {{circa}} 3.4 billion years old (Archean)")
![foliated]] [[amphibolite]]s) cutting light grey Lewisian gneiss of the Scourie complex, both deformed and cut by later (unfoliated) pink granite dikes](https://commons.wikimedia.org/wiki/Special:FilePath/Road Cutting - geograph.org.uk - 820828.jpg?width=200 "foliated]] [[amphibolite]]s) cutting light grey Lewisian gneiss of the Scourie complex, both deformed and cut by later (unfoliated) pink granite dikes")
![migmatitic]] paragneiss in the [[Kosterhavet National Park]] in the [[Koster Islands]] off the western coast of Sweden.](https://commons.wikimedia.org/wiki/Special:FilePath/Yttre Ursholmen Kontakt Kosterdiabas i Nebulitisk-migmatitisk sedimentgnejs.jpg?width=200 "migmatitic]] paragneiss in the [[Kosterhavet National Park]] in the [[Koster Islands]] off the western coast of Sweden.")
gneiss
n. γνευσίτης
تعريف
gneiss
[n??s]
¦ noun a typically coarse-grained metamorphic rock with a banded or foliated structure.
Derivatives
gneissic adjective
gneissose adjective
Origin
C18: from Ger., from Old High Ger. gneisto 'spark' (because of the rock's sheen).
ويكيبيديا
Gneiss
Gneiss ( NICE) 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. 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.
