File:Graphic granite (runite) (Paleoproterozoic intrusion in the Belomorian Terrane of the Baltic Shield; Enskoye area, east of Kovdor, southwestern Kola Peninsula, far-nw Russia) 4 (14979617656).jpg

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Graphic granite from the Precambrian of 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 and consist of interpenetrating crystals (quartz in potassium feldspar), in a way that somewhat resembles ancient cuneiform writing (“graphic”). Some observed examples resemble Arabic writing. These rocks occur in pegmatitic granite intrusions.

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
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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) 4
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@N05/14979617656 (archive). It was reviewed on 9 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 October 2019

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current05:30, 9 October 2019Thumbnail for version as of 05:30, 9 October 20192,999 × 2,249 (469 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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