File:Agate (east of the Black Hills, South Dakota, USA) 28.jpg
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| Description |
English: Agate from 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 - it probably is. Locality: undisclosed site east of the Black Hills, western South Dakota, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53158869699/ |
| 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@N05/53158869699. It was reviewed on 2 September 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:41, 2 September 2023 | | 2,779 × 2,056 (3.2 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53158869699/ with UploadWizard |
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