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Qué (quién) es gneiss - definición
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
·noun A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss.
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).
Gneiss
Gneiss () 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.
Wikipedia
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.
