File:Volga Blue Granite (anorthosite) (Volodarsk-Volhynsky Intrusion, Korosten Complex, Paleoproterozoic, 1.758-1.760 Ga; Zhitomir Province, Ukraine) 5 (33882335822).jpg

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"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.
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Source Volga Blue Granite (anorthosite) (Volodarsk-Volhynsky Intrusion, Korosten Complex, Paleoproterozoic, 1.758-1.760 Ga; Zhitomir Province, Ukraine) 5
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@N05/33882335822 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 October 2019

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current05:55, 22 October 2019Thumbnail for version as of 05:55, 22 October 20195,232 × 5,152 (14.41 MB)Rudolphous (talk | contribs)Transferred from Flickr via #flickr2commons

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