File:Volkonskoite-replaced fossil wood, Mt. Efimiatsk, Chastinsky District, Russia.jpg

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Volkonskoite-replaced fossil wood from the Permian of Russia. (4.9 cm across at its widest)

This is a very rare specimen of fossil wood from Permian rocks in western Russia. Most fossil wood is preserved by quartz-permineralization or carbonization. This fossil wood has been replaced by a rare chromian smectite clay mineral called volkonskoite (Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10 (OH)2⋅4H2O - hydrous calcium chromium magnesium iron hydroxy-aluminosilicate). The chromium (Cr) content gives the fossil its green coloration. The striations appear to be remnants of the original wood structure.

Host rocks & age: soft fluvial sandstones, Kazanian to Tatarian Stages, upper Upper Permian

Locality: Mt. Efimiatsk (Mt. Efimyatskaya), near the town of Efimyata, ~10 miles west of Votinsk Reservoir & ~30 miles southwest of Okhansk, Chastinsky District, southwestern Perm Region, western foothills of the southwestern Ural Mountains, western Russia
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Source Volkonskoite-replaced fossil wood (Upper Permian; Mt. Efimiatsk, Chastinsky District, foothills of the Ural Mountains, Russia) 8
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/19001002448. It was reviewed on 28 June 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

28 June 2015

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current19:17, 28 June 2015Thumbnail for version as of 19:17, 28 June 20152,860 × 2,098 (2.64 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2Commons

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