File:Andesite (near Belleville, Mineral County, Nevada, USA).jpg
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| Description |
English: Andesite (slightly porphyritic andesite) from Nevada, USA.
Igneous rocks form by the cooling & crystallization of hot, molten rock (magma & lava). If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. If this happens deep underground, they are intrusive igneous rocks. Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy. Andesite is an extrusive igneous rock. It has an aphanitic texture (= finely crystalline - all or almost all crystals are <1 mm in size), the result of relatively quick cooling of rather viscous lava. Andesite has a chemical composition between that of rhyolite's felsic chemistry and basalt's mafic chemistry. Andesite is an example of an intermediate igneous rock, which has 52 to 65% silica (= SiO2 chemistry) (it has also been defined as 55 to 65% silica). Intermediate igneous rocks are sometimes light-colored, sometimes dark-colored, and sometimes have medium colors. Age: probably Cenozoic Locality: unrecorded site near Belleville, southern Mineral County, western Nevada, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/16552085407/ |
| 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@N05/16552085407. It was reviewed on 15 November 2020 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 | |
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| current | 11:48, 15 November 2020 | | 1,105 × 994 (1.99 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/16552085407/ with UploadWizard |
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