File:Blue Night Granite (anorthosite).jpg

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English: 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, coarsely-crystalline anorthosite shown above is a polished decorative stone. Many of the labradorite crystals are flashing deep electric blue. I have not verified the retail market name or the provenance of this rock. It may be from Ukraine or Angola (?).
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Source https://www.flickr.com/photos/47445767@N05/35492554521/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/35492554521. 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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current05:58, 9 October 2020Thumbnail for version as of 05:58, 9 October 20205,504 × 5,152 (8.5 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/35492554521/ with UploadWizard

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