File:Sandstone with chalcedony-lined vug (Valentine Formation, Miocene; Great Plains, USA) 1.jpg
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| Description |
English: (outdoor public display, Ashfall Fossil Beds State Historical Park, Nebraska, USA)
Sandstone is the # 2 most siliciclastic sedimentary rock on Earth. As the name suggests, it is principally composed of sand-sized particles, which are between 2 and 1/16 of a millimeter in size. Sandstone is dominated by silicate minerals, usually quartz, but feldspar, mica, and rock fragments can be common components. This sandstone sample has a cavity lined with grayish mammiform chalcedony. Chalcedony is translucent, microcrystalline, fibrous quartz (SiO2 - silicon dioxide). It's what makes up individual layers in "agate". Stratigraphy: Crookston Bridge Member, Valentine Formation, Miocene, ~13 Ma Locality: undisclosed, but possibly from Nebraska, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52269003255/ |
| 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@N05/52269003255. It was reviewed on 15 November 2022 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 | 19:11, 12 November 2022 | | 3,008 × 2,000 (4.37 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52269003255/ with UploadWizard |
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