File:Garnet schist 1 (16735443408).jpg
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Summary
[edit]DescriptionGarnet schist 1 (16735443408).jpg |
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. Garnet schist (see above photo) has conspicuous, large or small garnet crystals. Garnets in schists are typically very deep red-colored. The surrounding matrix is often a grayish and mica-rich. |
Date | |
Source | Garnet schist 1 |
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@N05/16735443408 (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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current | 06:23, 2 December 2019 | ![]() | 3,444 × 2,540 (3.75 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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F-number | f/4 |
ISO speed rating | 640 |
Date and time of data generation | 10:35, 22 November 2014 |
Lens focal length | 10.615 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 23:52, 24 March 2015 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 10:35, 22 November 2014 |
Meaning of each component |
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APEX shutter speed | 5.90625 |
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APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
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Focal plane resolution unit | inches |
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File source | Digital still camera |
Custom image processing | Normal process |
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Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 3,444 px |
Image height | 2,540 px |
Rating (out of 5) | 0 |
Date metadata was last modified | 19:52, 24 March 2015 |
IIM version | 2 |