File:Anorthoclase feldspar with iridescent hematite inclusions (Potanikha Quarry, Kasli, Ural Mountains, Russia) 7 (29810807540).jpg

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Anorthoclase feldspar with iridescent hematite inclusions from Russia. (field of view ~5.7 cm across)

This is a large single crystal of anorthoclase feldspar ((K,Na)AlSi3O8 - potassium sodium aluminosilicate), probably derived from a pegmatitic granite body. The small, colorful specks (click on the above photo to zoom in) are inclusions of iridescent, hexagonal to anhedral tabular hematite (Fe2O3 - iron oxide). The feldspar itself has some adularescence at certain light angles (just visible in this shot), making it a "moonstone". The colorful hematite inclusions make this a "sunstone". The end result is "Sun-Moon Stone".

Locality: Potanikha Quarry (vermiculite quarry at or near the town of Kasli), northern Chelyabinsk Province, in the Potaninskie Mountains (Potaniny Mountains), eastern side of the southern Ural Mountains, western Russia
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Source Anorthoclase feldspar with iridescent hematite inclusions (Potanikha Quarry, Kasli, Ural Mountains, Russia) 7
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@N05/29810807540 (archive). It was reviewed on 16 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

16 November 2018

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current12:41, 16 November 2018Thumbnail for version as of 12:41, 16 November 20182,996 × 2,103 (4.11 MB)NMaia (talk | contribs)Transferred from Flickr via #flickr2commons

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