File:Talc Schist 18.jpg
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Summary
editDescriptionTalc Schist 18.jpg |
English: 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. Talc schist is a metamorphic rock dominated by the mineral talc. Its color usually ranges from mottled, creamy white to mottled gray to light green. It has a pearly luster and a slick, soapy feel. Talc schist, like soapstone and steatite and the mineral talc itself, is very soft (H = 1). Unlike soapstone and steatite (= talcose, crystalline-textured metamorphic rocks), talc schist has a foliated texture (this sample is being viewed on edge, so the foliation is visible). Some talc schists have formed by hydrothermal metamorphism of dolomitic marbles. Other talc schists are produced by hydrothermal metamorphism of serpentinized peridotites. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/52763695309/ |
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@N05/52763695309. It was reviewed on 22 March 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 March 2023
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:43, 22 March 2023 | 3,603 × 1,976 (5.47 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52763695309/ with UploadWizard |
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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/9 |
ISO speed rating | 80 |
Date and time of data generation | 13:40, 10 March 2023 |
Lens focal length | 8.295 mm |
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 18.0 (Macintosh) |
File change date and time | 00:39, 22 March 2023 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:40, 10 March 2023 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 20:39, 21 March 2023 |
Unique ID of original document | 152791D654402215FA686E84A1E0F627 |