File:Labrador Antique Granite (anorthosite, Rogaland Anorthosite Complex, Mesoproterozoic, 929-932 Ma; near Egersund, Norway).jpg

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English: "Labrador Antique Granite" - coarsely-crystalline anorthosite from the Precambrian of Norway.

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.

Each brown crystal in the polished decorative stone surface shown above will flash bright electric blue if the rock is tilted at the correct angle. Despite the retail market name, this rock does not come from Canada. It comes from the Rogaland Anorthosite Complex of southwestern Norway. The Rogaland Anorthosite Complex is a late Mesoproterozoic intrusion that dates to about 929-932 million years. It is quarried near the town of Egersund in southern coastal Rogaland County, far-southwestern Norway.
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Source https://www.flickr.com/photos/47445767@N05/14790329146/
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@N05/14790329146. 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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current05:57, 9 October 2020Thumbnail for version as of 05:57, 9 October 2020821 × 770 (172 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14790329146/ with UploadWizard

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