File:Garnet-chlorite schist (Alabama, USA) (49155351038).jpg
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DescriptionGarnet-chlorite schist (Alabama, USA) (49155351038).jpg |
Garnet-chlorite schist from Alabama, USA. (public display, Dakota Dinosaur Museum, Dickinson, North Dakota, 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). 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. Chlorite schist is a moderately common metamorphic rock. It is principally composed principally of chlorite, a silicate mineral with a greenish to grayish-green color. This sample has conspicuous deep-red colored almandine garnets. Locality: unrecorded/undisclosed site in Alabama USA (but likely from the Lake Martin area, eastern Alabama) |
Date | |
Source | Garnet-chlorite schist (Alabama, USA) |
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@N05/49155351038 (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 | 06:24, 2 December 2019 | 2,217 × 1,778 (6.41 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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F-number | f/5.6 |
ISO speed rating | 1,600 |
Date and time of data generation | 16:48, 27 August 2008 |
Lens focal length | 200 mm |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 23:08, 1 December 2019 |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 16:48, 27 August 2008 |
APEX shutter speed | 7.3219280719281 |
APEX aperture | 4.9708536585366 |
APEX exposure bias | 0 |
Maximum land aperture | 5.0219238147438 APEX (f/5.7) |
Metering mode | Pattern |
Light source | Unknown |
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DateTime subseconds | 80 |
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DateTimeDigitized subseconds | 80 |
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Color space | sRGB |
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File source | Digital still camera |
Scene type | A directly photographed image |
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Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
Scene control | Low gain up |
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Subject distance range | Unknown |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Serial number of camera | 1004a0cc |
Date metadata was last modified | 18:08, 1 December 2019 |
Unique ID of original document | F0D0E0845A16B9D7B7A32657B3A46EBA |