File:Muscovite schist (Precambrian; Blue Ridge, North Carolina, USA) 10.jpg
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| Description |
English: Muscovite schist in the Precambrian of North Carolina, USA.
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Many metamorphic rocks have a foliated texture, but some are crystalline or glassy. Schist is an intermediate- to high-grade, foliated metamorphic rock. It is highly variable in appearance, depending on the mineral content, which is a function of the precursor rock and specific temperature-pressure conditions. Garden-variety schists form by metamorphism of phyllites. Schists typically have medium- to large-sized crystals, unlike the microcrystalline nature of slate & phyllite. Schist's foliated texture (= crystals aligned into bands or stripes or layers) is often only seen when specimens are viewed on edge. Seen here is a muscovite-rich schist in the Blue Ridge of North Carolina. The brownish coloration is iron oxide staining from weathering. Locality: roadcut at Woolyback overlook along the Blue Ridge Parkway, northern Jackson County, western North Carolina, USA (35° 28’ 03.49" North latitude, 83° 08’ 30.03" West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51362732878/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51362732878. It was reviewed on 10 August 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:19, 10 August 2021 | | 2,283 × 1,998 (4.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51362732878/ with UploadWizard |
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