File:Geode (Peebles, Ohio, USA) (36713025523).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.

This southern Ohio geode has small to large crystals of many minerals: quartz (SiO2 - silica), calcite (CaCO3 - calcium carbonate), barite (BaSO4 - barium sulfate), ferroan dolomite (CaMg(CO3)2 - calcium magnesium carbonate with significant iron impurity), pyrite (FeS2 - iron sulfide), and sphalerite (ZnS - zinc sulfide).
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Source Geode (Peebles, Ohio, USA)
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@N05/36713025523 (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
current18:42, 7 December 2019Thumbnail for version as of 18:42, 7 December 20193,474 × 2,536 (5.26 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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