File:Gneiss 2 (33239757534).jpg
Original file (2,651 × 1,980 pixels, file size: 3.33 MB, MIME type: image/jpeg)
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Summary
DescriptionGneiss 2 (33239757534).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. Gneiss is a high-grade, foliated metamorphic rock. It differs from lower grade foliated metamorphics, such as slate, phyllite, and schist, by having alternating bands or stripes of light and dark minerals. Metamorphism has been so intense that minerals have self-segregated into discrete zones. Most gneisses form by metamorphism of schists or granites. The specimen shown above is a quartz-biotite gneiss. The whitish-gray bands are dominated by quartz (SiO2) and the black bands are rich in biotite mica. |
Date | |
Source | Gneiss 2 |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/33239757534. 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
Items portrayed in this file
depicts
some value
9 April 2017
0.01666666666666666666 second
6.2 millimetre
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:18, 2 December 2019 | 2,651 × 1,980 (3.33 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
File usage
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Metadata
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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/8 |
ISO speed rating | 80 |
Date and time of data generation | 12:42, 9 April 2017 |
Lens focal length | 6.2 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 | 17:14, 16 April 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:42, 9 April 2017 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
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 | 13:14, 16 April 2017 |
Unique ID of original document | EF045CDC1DF8ECDDE54AA72B10D5EF0F |