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File:Blue Eyes Granite (anorthosite) Labrador.jpg

Blue_Eyes_Granite_(anorthosite)_Labrador.jpg ‎(669 × 574 pixels, file size: 252 KB, MIME type: image/jpeg)

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Blue Eyes Anorthosite - a coarsely-crystalline anorthosite from Labrador. All of the lightish to darkish gray material in this rock is labradorite - every crystal will flash bright blue when tilted at the correct angle in the light. This expensive decorative stone comes from the Ten Mile Bay Quarry, near the town of Nain along the Labrador coast, eastern Canada. The quarry exploits the Nain Anorthosite (Nain Plutonic Suite), a mid-Mesoproterozoic intrusion (1.29 to 1.35 billion years) emplaced along the Abloviak Shear Zone.

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.
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Source Blue Eyes Granite (anorthosite, Nain Anorthosite, 1.29-1.35 Ga, Mesoproterozoic; Ten Mile Bay Quarry, coastal Labrador, Canada)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14812968312. 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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current21:31, 3 August 2014Thumbnail for version as of 21:31, 3 August 2014669 × 574 (252 KB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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