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File:Graphic granite, southwestern Kola Peninsula Russia.jpg

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Summary

Description

Graphic granite from the Precambrian of Russia’s Kola Peninsula.

Geologic unit & age - apparently from a Paleoproterozoic granite pegmatite intrusion, Belomorian Terrane (Kola Province), Baltic Shield (Fennoscandian Shield).

Locality: Enskoye, east of Kovdor, ~257 km west of the town of Apatity in the southwestern Kola Peninsula of far-northwestern Russia.


Graphic granite (a.k.a. runic granite; a.k.a. runite) has an odd but distinctive type of crystalline texture. Graphic granites are typically bimineralic (K-feldspar & quartz) and consists of interpenetrating crystals (quartz in K-feldspar), in a way that somewhat resembles ancient cuneiform writing (“graphic”). Some observed examples resemble Arabic writing. These rocks occur in pegmatitic granite intrusions.
Date
Source Graphic granite (runite) (Paleoproterozoic intrusion in the Belomorian Terrane of the Baltic Shield; Enskoye area, east of Kovdor, southwestern Kola Peninsula, far-nw Russia) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14816086227. It was reviewed on 23 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

23 August 2014

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current00:32, 23 August 2014Thumbnail for version as of 00:32, 23 August 20142,999 × 2,249 (456 KB)TillmanTransferred from Flickr via Flickr2commons

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