File:Volga Blue Granite (anorthosite, Volodarsk-Volhynsky Intrusion, Korosten Complex, Paleoproterozoic, 1.758-1.760 Ga; Zhitomir Province, Ukraine) 1.jpg
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[edit]DescriptionVolga Blue Granite (anorthosite, Volodarsk-Volhynsky Intrusion, Korosten Complex, Paleoproterozoic, 1.758-1.760 Ga; Zhitomir Province, Ukraine) 1.jpg |
English: "Volga Blue Granite" - coarsely-crystalline anorthosite from the Precambrian of Ukraine.
Anorthosites are uncommon intrusive igneous rocks almost exclusively composed of Ca-rich plagioclase feldspar. There’s usually a blackish pyroxene component as well. Anorthosites having labradorite plagioclase feldspar will display a wonderfully colorful iridescent play of colors (labradorescence). This makes them desirable decorative stones. The dark, very coarsely-crystalline anorthosite shown above is from Ukraine. It is remarkable in having obvious zoned plagioclase feldspar. This is from the Volodarsk-Volhynsky Intrusion in the southern Korosten Complex, a large igneous suite intruded through the Ukrainian Shield. The Volodarsk-Volynsky Intrusion dates to the late Paleoproterozoic (1.758-1.760 Ga). This material is quarried between the cities of Korosten and Zhitomir, central Zhitomir Province, northwestern Ukraine. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/14811063284/ |
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@N05/14811063284. It was reviewed on 9 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 October 2020
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current | 05:57, 9 October 2020 | 964 × 675 (138 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14811063284/ with UploadWizard |
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