File:Agate (east of the Black Hills, South Dakota, USA) 3.jpg
![File:Agate (east of the Black Hills, South Dakota, USA) 3.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Agate_%28east_of_the_Black_Hills%2C_South_Dakota%2C_USA%29_3.jpg/790px-Agate_%28east_of_the_Black_Hills%2C_South_Dakota%2C_USA%29_3.jpg?20200904053258)
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Summary
editDescriptionAgate (east of the Black Hills, South Dakota, USA) 3.jpg |
English: Agate from near the Black Hills of western South Dakota, USA.
"Agate" is a rockhound/collector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz. Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands. This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills. Some of this gravel is agate. The Fairburn-area agates are remarkably colorful and desirable. The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars. Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills. This specimen has been identified as a Fairburn Agate, but I am uncertain. Locality: undisclosed site east of the Black Hills, western South Dakota, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50255258783/ |
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@N05/50255258783. It was reviewed on 4 September 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 September 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:32, 4 September 2020 | ![]() | 2,388 × 1,813 (2.47 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50255258783/ 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/11 |
ISO speed rating | 80 |
Date and time of data generation | 22:46, 21 August 2020 |
Lens focal length | 11.614 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 | 01:41, 22 August 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 22:46, 21 August 2020 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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 | 21:41, 21 August 2020 |
Unique ID of original document | 2402EC8B65DDDBFBA46C9E1F7F9EF335 |