File:Quartz geode with surficial beekite rings (40090652560).jpg

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Geodes are small to large, subspherical to irregularly-shaped, crystal-lined cavities in rocks. They form when water enters a void in a host rock and precipitates crystals. The most common geode-lining mineral is quartz.

The concentric structures seen on the surface of this uncracked geode (click on the photo to zoom in and look around) are called beekite rings - they are made of quartz.
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Source Quartz geode with surficial beekite rings
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@N05/40090652560 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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Date/TimeThumbnailDimensionsUserComment
current18:43, 7 December 2019Thumbnail for version as of 18:43, 7 December 20192,302 × 2,201 (3.34 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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