How does gneiss rock form

Gneiss displays distinct foliation , representing alternating layers composed of different minerals. Because of the coarseness of the foliation, the layers are often sub-parallel, i. Take part now Geology toolkit. Activity Level: 1 Introductory.

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After metamorphism, the schist is very foliated the minerals of the rock are arranged in layers. It can be easily split into thin, flakey pieces. Schists often have a high luster they are very shiny due to large crystals within the rock.

This will confuse many students and cause others to incorrectly identify the rock. Teachers can avoid these problems by collecting specimens that clearly display a banded structure. Teachers who purchase specimens must examine them carefully before they are presented to students. After students have learned to identify gneiss and many other rock types, presenting specimens of gneiss that do not exhibit banding can be a challenging way to have students: A consider possibilities that are not obvious, and, B realize that a single rock specimen may not adequately represent a rock unit.

Article by: Hobart M. Find Other Topics on Geology. Maps Volcanoes World Maps. What Is Gneiss? How Does Gneiss Form? Rock, Mineral and Fossil Collections.

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