Identifying Metamorphic Rocks -- Earth Rocks!
14:18
YouTubeEarth Rocks!
Identifying Metamorphic Rocks -- Earth Rocks!
For an introductory college-level physical geology class: a review of how to classify and identify a metamorphic rock. Includes a discussion of foliation and other clues to look for in a rock to indicate the intensity or grade of metamorphism to which the rock was subjected. Reviews how to identify each of the following rocks, including what ...
428.4K viewsJun 26, 2014
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Gneiss (pronounced (nice) is a foliated metamorphic rock characterized by distinct banding or layering, caused by the segregation of light- and dark-colored minerals. Appearance * Shows alternating light and dark bands * Light bands:mostly ,quartz and feldspar* * Dark bands: contain biotite, hornblende, or pyroxene * Often coarse-grained and very hard. Formation (Metamorphism) Gneiss forms through: 1. Regional metamorphism: deep burial and compression over large areas, such as mountain belts. 2.
Gneiss (pronounced (nice) is a foliated metamorphic rock characterized by distinct banding or layering, caused by the segregation of light- and dark-colored minerals. Appearance * Shows alternating light and dark bands * Light bands:mostly ,quartz and feldspar* * Dark bands: contain biotite, hornblende, or pyroxene * Often coarse-grained and very hard. Formation (Metamorphism) Gneiss forms through: 1. Regional metamorphism: deep burial and compression over large areas, such as mountain belts. 2.
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