File:Aplite dike in Butte Quartz Monzonite (Late Cretaceous, 76 Ma; Orphan Boy Mine, Butte, Montana, USA) 10.jpg
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English: Aplite (top) in quartz monzonite in the Cretaceous of Montana, USA.
Igneous dikes are planar to irregularly-planar igneous intrusions that cut across country rocks. They can be thin or extremely thick & they can be vertically- or obliquely-oriented. The rock seen here is a loose piece in a mine waste rock pile in Butte, Montana. The lighter-colored area at the top is an igneous dike composed of aplite, which is finely-crystalline and granitic in composition. The speckled grayish areas are the host rock - Butte Quartz Monzonite (Late Cretaceous, 76 Ma), Locality: Orphan Boy Mine, western side of the town of Butte, southwestern Montana, USA (vicinity of 46° 00' 42.36" North latitude, 112° 34' 05.50" West longitude) |
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| Source | https://www.flickr.com/photos/47445767@N05/51010865291/ |
| 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@N05/51010865291. It was reviewed on 8 March 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 15:20, 8 March 2021 | | 3,008 × 2,000 (4.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51010865291/ with UploadWizard |
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