File:Granite (Cape Ann Complex, Late Ordovician to Late Silurian, 426-450 Ma; Rockport, Massachusetts, USA) 1.jpg
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| Description |
English: Hornblende granite from the Paleozoic of Massachusetts, 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. Seen here is granite, a common felsic, phaneritic, intrusive igneous rock dominated by potassium feldspar and quartz. Other common minerals in granite include hornblende amphibole, muscovite mica, and biotite mica. Geologic unit: Cape Ann Complex (Cape Ann Plutonic Suite; Cape Ann Plutonic Complex), Late Ordovician to Late Silurian, 426 to 450 Ma Locality: unrecorded site at or near the town of Rockport, Cape Ann, eastern Essex County, far-northeastern Massachusetts, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52150684221/ |
| 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@N05/52150684221. 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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| current | 08:28, 19 June 2022 | | 2,759 × 2,227 (4.2 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52150684221/ with UploadWizard |
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