File:Cracking a geode (Las Choyas Geode Deposit, near-latest Eocene, ~35 Ma; Chihuahua, Mexico) 1 (32754411175).jpg

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Geode from the Eocene of Mexico. (47th Annual Gem, Mineral, Fossil & Jewelry Show of Greater Cincinnati, Ohio, USA)

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.
Date
Source Cracking a geode (Las Choyas Geode Deposit, near-latest Eocene, ~35 Ma; Chihuahua, Mexico) 1
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@N05/32754411175 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current02:03, 6 December 2019Thumbnail for version as of 02:03, 6 December 20192,992 × 2,396 (5.29 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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