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File:Blue diopsidite skarn Buryatia Republic, Transbaikalia, eastern Siberia.jpg

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Description

Blue diopsidite skarn (tumble-polished specimen) from the Neoproterozoic of the Dovyren Highlands, eastern Siberia, Russia.

Skarn is a coarsely-crystalline, contact metamorphic rock. The attractive rock shown here is a rare variety of skarn dominated by bluish-colored diopside pyroxene (“violane” or “violan”) ((Ca,Mg,Fe)₂Si₂O₆). Such rocks are called diopsidite skarn.

Geologic origin & context & age: magnesium skarn formed by metamorphism of dolostone xenoliths by a gabbro-peridotite layered intrusion, Yoko-Dovyrensky Massif, Neoproterozoic, ~700 Ma.

Locality: Dovyren Highlands, Buryatia Republic, Transbaikalia, eastern Siberia, Russia.
Date
Source Blue diopsidite skarn (Neoproterozoic, about 700 Ma; Dovyren Highlands, Buryatia Republic, Transbaikalia, eastern Siberia, Russia) 1
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15079580766. It was reviewed on 1 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

1 September 2014

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