File:Peacock coal 11.jpg
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English: Coal is a carbon-rich, biogenic sedimentary rock. Many coal ranks exist, such as lignite coal, sub-bituminous coal, and bituminous coal. Other varieties include cannel coal, canneloid coal, bone coal, and stone coal. Seen here is anthracite coal, which is metamorphic variety, the result of very low grade metamorphism ("anchimetamorphism") of ordinary coal. The iridescent coating 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 (purchased from a gift shop at the Pioneer Tunnel Coal Mine in Ashland, Pennsylvania, USA) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50656174972/ |
| 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@N05/50656174972. It was reviewed on 28 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:25, 28 November 2020 | | 2,599 × 1,611 (3.29 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50656174972/ with UploadWizard |
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