File:Shungite (Zaonezhskaya Formation, middle Paleoproterozoic, 1.98-2.09 Ga; Shun'ga River area, northwestern Russia) 19.jpg
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| Description |
English: Shungite from the Precambrian of Russia.
Shungite is a rare type of asphaltite from Russia. It is composed of noncrystalline, non-graphitized carbon. It occurs in the upper Zaonezhskaya Formation, a Precambrian-aged platform succession of sedimentary rocks. In the unit, this unusual material occurs as stratiform shungite, diapiric shungite, redeposited clastic/detrital shungite, and vein shungite. The specific origin is uncertain - the literature refers to shungite as either pyrobitumen or Precambrian coal or carbonized hydrocarbons or highly-evolved bitumen. Shungite is black-colored, slightly lightweight for its size and varies from dull lustered to glassy-lustered. The latter variety looks somewhat like obsidian and is called "elite shungite" or "noble shungite" by rockhounds - it is rare and ~98% carbon (see photos elsewhere in this album). The specimen seen here is ordinary shungite - a brecciated texture is present. Host unit: Zaonezhskaya Formation, Ludikovi Group, middle Paleoproterozoic, 1.98 to 2.09 Ga; greenschist-facies metamorphism at 1.8 Ga Locality: unrecorded locaity in the shungite mining field, northern Lake Onega area, southern Karelia Republic, south of the White Sea, southeastern Fennoscandian Shield, northwestern Russia |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51445882117/ |
| 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@N05/51445882117. It was reviewed on 13 September 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 17:56, 13 September 2021 | | 4,000 × 2,729 (4.57 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51445882117/ with UploadWizard |
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