File:Porphyritic andesite (Boulder County, Colorado, USA).jpg
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Size of this preview: 633 × 599 pixels. Other resolutions: 254 × 240 pixels | 507 × 480 pixels | 811 × 768 pixels | 1,082 × 1,024 pixels | 2,164 × 2,048 pixels | 2,653 × 2,511 pixels.
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| Description |
English: Andesite is an intermediate, extrusive igneous rock. Extrusive rocks form at or near the surface, or on the seafloor. Andesites are "supposed" to have an aphanitic texture (finely crystalline), but most are porphyritic. Porphyritic-textured igneous rocks have a mix of large and small crystals. The large crystals are called phenocrysts. Surrounding the phenocrysts is the groundmass, consisting of small crystals. Mineralogically, andesites are dominated by plagioclase feldspar, plus amphibole and/or pyroxene.
Locality: unrecorded / undisclosed site in Boulder County, Colorado, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52150841890/ |
| 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@N05/52150841890. It was reviewed on 19 June 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 | 08:33, 19 June 2022 | | 2,653 × 2,511 (4.55 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52150841890/ with UploadWizard |
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