File:Tourmaline-mica schist (near Custer, South Dakota, USA) (40158163570).jpg
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[edit]DescriptionTourmaline-mica schist (near Custer, South Dakota, USA) (40158163570).jpg |
Tourmaline-mica schist from the Precambrian of South Dakota, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, 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. This Precambrian-aged schist sample from the Black Hills of South Dakota is dominated by mica (= light-colored) and tourmaline (= black sticks). Locality: unrecorded/undisclosed site near the town of Custer, Black Hills, western South Dakota, USA |
Date | |
Source | Tourmaline-mica schist (near Custer, South Dakota, 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@N05/40158163570 (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 | 2,504 × 2,340 (4.56 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/14 |
ISO speed rating | 125 |
Date and time of data generation | 15:25, 24 March 2018 |
Lens focal length | 18.6 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 22:36, 7 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:25, 24 March 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 7.625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4.59375 APEX (f/4.91) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:36, 7 May 2018 |
Unique ID of original document | 4D807BBA30D732E407FF98F273DFC289 |
IIM version | 32,767 |