File:Graphic granite (runite) (Paleoproterozoic, 1.695 to 1.715 Ga; Rt. 16 roadcut southeast of Custer, Black Hills, western South Dakota, USA) (14815961890).jpg

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Graphic granite with whitish-gray K-feldspar & dark-gray quartz.

Geologic unit & age: pegmatitic granite intruding schist, Paleoproterozoic, ~1.695-1.715 b.y.

Locality: Rt. 16 roadcut southeast of Custer, Black Hills, western South Dakota, USA.

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 consist 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.
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Source Graphic granite (runite) (Paleoproterozoic, 1.695 to 1.715 Ga; Rt. 16 roadcut southeast of Custer, Black Hills, western South Dakota, USA)
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@N05/14815961890. It was reviewed on 12 May 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

12 May 2017

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current18:33, 12 May 2017Thumbnail for version as of 18:33, 12 May 20172,999 × 2,249 (505 KB)Runner1928 (talk | contribs)Transferred from Flickr via Flickr2Commons

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