Image: Volga Blue Granite (anorthosite) Zhitomir Province, Ukraine
Description: Volga Blue Granite - 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.
Title: Volga Blue Granite (anorthosite) Zhitomir Province, Ukraine
Credit: Volga Blue Granite (anorthosite, Volodarsk-Volhynsky Instrusion, Korosten Complex, 1.758-1.760 Ga, Paleoproterozoic; Zhitomir Province, Ukraine) 1
Author: James St. John
Usage Terms: Creative Commons Attribution 2.0
License: CC BY 2.0
License Link: https://creativecommons.org/licenses/by/2.0
Attribution Required?: Yes
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