File:Porphyritic trachyte (Bannockburn, Ontario, Canada).jpg
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| Description |
English: Porphyritic trachyte from Ontario, Canada. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)
Porphyritic rocks are crystalline-textured igneous rocks having a mixture of large crystals (phenocrysts) and small crystals (groundmass). The large, light-colored, angular masses in the rock seen above are potassium feldspar phenocrysts. The dark brown-colored groundmass is very finely-crystalline plagioclase feldspar and biotite mica. Not much specific geologic information seems to be available on this material from Bannockburn, Ontario, despite it being a famous occurrence and a distinctive rock. The porphyritic trachyte from the site is reported to in an igneous dike, which is a planar intrusion that cuts across country rocks. Locality: unrecorded/undisclosed site attributed to Bannockburn Township, apparently ~1.4 air-kilometers northeast of Rahn Lake & ~19.4 air-kilometers west-northwest of the town of Matachewan, northwestern Timiskaming District, eastern Ontario, southeastern Canada |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/41502736481/ |
| 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@N05/41502736481. 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 | 08:22, 19 June 2022 | | 1,958 × 1,786 (2.34 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/41502736481/ with UploadWizard |
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