File:Talc schist 2 (16921632302).jpg
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Summary
[edit]DescriptionTalc schist 2 (16921632302).jpg |
Talc schist (9.7 centimeters across at its widest) 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. Many samples have a mottled creamy white color, with 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 (in the sample shown above, the foliation is only seen when viewing the rock on edge). Some talc schists have formed by hydrothermal metamorphism of dolomitic marbles. Other talc schists are produced by hydrothermal metamorphism of serpentinized peridotites. |
Date | |
Source | Talc schist 2 |
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@N05/16921632302 (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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:23, 2 December 2019 | 2,674 × 1,900 (1.94 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/640 sec (0.0015625) |
F-number | f/6.3 |
ISO speed rating | 200 |
Date and time of data generation | 17:05, 4 May 2006 |
Lens focal length | 105 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 23:20, 24 March 2015 |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 17:05, 4 May 2006 |
Image compression mode | 4 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.3 APEX (f/3.14) |
Metering mode | Spot |
Light source | Tungsten (incandescent light) |
Flash | Flash did not fire |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 157 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Soft |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,674 px |
Image height | 1,900 px |
Date metadata was last modified | 19:20, 24 March 2015 |