File:Verde Lavras Granite (orthogneiss, Paleoproterozoic, 1.9 Ga; Lavras, Minas Gerais State, Brazil) (14626857039).jpg
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| Description |
Verde Lavras Granite - a Paleoproterozoic (1.9 billion years) orthogneiss (metamonzogranite) from Lavras in Minas Gerais State, southeastern Brazil. The gneissic foliation is on a coarse scale, but is still recognizable (see elongated, large, greenish-gray feldspars & the elongated, irregularly wavy, black mafic areas). This rock has plagioclase feldspar, quartz, perthitic microcline feldspar, hornblende amphibole, and biotite mica. Gneiss is a common high-grade, foliated metamorphic rock characterized by alternating bands of light- and dark-colored minerals. It forms by metamorphism of schists or felsic-to-intermediate intrusive igneous rocks (e.g., granite). |
| Date | |
| Source | Verde Lavras Granite (orthogneiss, Paleoproterozoic, 1.9 Ga; Lavras, Minas Gerais State, Brazil) |
| Author | James St. John |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14626857039 (archive). It was reviewed on 2 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 | 06:18, 2 December 2019 | | 1,367 × 1,098 (390 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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