File:Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 10 (21416041126).jpg
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| Description |
Porphyritic granite in the Precambrian of Minnesota, USA. (geology hammer for scale) This attractive rock consists of pinkish-orangish potassium feldspar phenocrysts (KAlSi3O8) with a groundmass of quartz (gray), plagioclase feldspar (whitish-gray), and one or more mafic minerals (black). Geologic unit & age: Giants Range Batholith, Neoarchean, 2.67-2.68 Ga Locality: roadcut on the northern side of Rt. 1, between mileposts 296 and 295, north of the South Kawishiwi River & southeast of the town of Ely, northwestern Lake County, northeastern Minnesota, USA (47° 49' 05.61" North, 91° 45' 14.19" West) |
| Date | |
| Source | Porphyritic granite (Giants Range Batholith, Neoarchean, 2.67-2.68 Ga; Rt. 1 roadcut north of the South Kawishiwi River, Minnesota, USA) 10 |
| 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@N05/21416041126 (archive). It was reviewed on 5 December 2019 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 | 05:47, 5 December 2019 | | 3,860 × 2,998 (4.01 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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