File:Peacock coal 6.jpg

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English: (original photo by Donna Pizzarelli; public domain photo provided by the United States Geological Survey)

Coal is a carbon-rich, biogenic sedimentary rock. Many coal ranks exist, such as lignite coal, sub-bituminous coal, bituminous coal, and anthracite coal (the latter is actually a metamorphic rock, not sedimentary). Other varieties include cannel coal, semi-cannel coal, bone coal, and stone coal.

The iridescent coating seen here makes the coal quite colorful, resulting in the term "peacock coal". I have yet to see specific, convincing information about the identity of iridescent coatings on peacock coal, but I strongly suspect it's turgite (= hydrous iron oxide).

Provenance: unrecorded/undisclosed
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Source https://www.flickr.com/photos/47445767@N05/50504419991/
Author James St. John
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50504419991. It was reviewed on 3 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

3 December 2020

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current02:02, 20 October 2020Thumbnail for version as of 02:02, 20 October 20201,467 × 1,196 (1.6 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50504419991/ with UploadWizard

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