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File:Volga Blue Granite (anorthosite) Zhitomir Province, Ukraine.jpg

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Volga Blue Anorthosite - a dark, very coarsely-crystalline anorthosite with zoned plagioclase feldspar from Ukraine. 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.


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.
Date
Source Volga Blue Granite (anorthosite, Volodarsk-Volhynsky Instrusion, Korosten Complex, 1.758-1.760 Ga, Paleoproterozoic; Zhitomir Province, Ukraine) 1
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14811063284. It was reviewed on 3 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 August 2014

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current21:49, 3 August 2014Thumbnail for version as of 21:49, 3 August 2014964 × 675 (462 KB)TillmanTransferred from Flickr via Flickr2commons

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