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what are the minerals in gneiss

A foliated rock formed by regional metamorphism, in which bands or lenticles of granular minerals alternate with bands or lenticles in which minerals having flaky or elongate prismatic habits predominate Generally less than 50 of the minerals show preferred parallel orientation Although a gneiss

Gneiss is a very widespread rock type, especially in the lower parts of the continental crust, but it is also a common rock on the surface in some places Scandinavia, Canada, and other shield areas where crystalline rocks are not covered by a layer of sedimentary rocks

Gneiss is a medium to course grained metamorphic rock Shale is the typical parent rock It is made up of clay minerals Shale can metamorphose into slate, phyllite, schist or gneiss depending on the degree of heat and pressure

Gneiss It is formed by the metamorphosis of granite , or sedimentary rock However, unlike slate and schist, gneiss does not preferentially break along planes of foliation because less than 50 of the minerals formed during the metamorphism are aligned in thin layers

Gneiss glossary term at minerals net educational reference guide

What is Gneiss? Gneiss is a foliated metamorphic rock identified by its bands and lenses of varying composition, while other bands contain granular minerals with an interlocking texture

I've been going to gem and mineral shows for years and I have to say that the Gneiss Guys are always the first booth I check out once I'm finished there, I don't really need to

Gneiss is a metamorphic rock form characterized by banding caused by segregation of different types of rock, typically light and dark silicates Rather than an indication of specific mineral composition, the term is an indication of texture The gneissic texture refers to the segregation of light and dark minerals It is indicative of high grade metamorphism where the temperature is high

Gneiss can be classified on the basis of minerals that are present, presumed formational processes, chemical composition, or probable parent material Orthogneiss is formed by the metamorphism of igneous rocks paragneiss results from the metamorphism of sedimentary rocks

 
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