File:Biotite schist (16896874736).jpg
![File:Biotite schist (16896874736).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Biotite_schist_%2816896874736%29.jpg/742px-Biotite_schist_%2816896874736%29.jpg?20191202062316)
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Summary
[edit]DescriptionBiotite schist (16896874736).jpg |
Biotite schist (3.6 centimeters across at its widest) 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). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. 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. The biotite schist shown above is a common variety of mica schist. Biotite schists are dominated by biotite mica, but often contain a significant muscovite mica component. |
Date | |
Source | Biotite schist |
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@N05/16896874736 (archive). It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:23, 2 December 2019 | ![]() | 2,059 × 1,663 (1.35 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 23:05, 24 March 2015 |
Color space | Uncalibrated |
Image width | 2,059 px |
Image height | 1,663 px |
Date and time of digitizing | 05:40, 19 February 2007 |
Date metadata was last modified | 19:05, 24 March 2015 |
IIM version | 2 |