File:Graphic granite (runite) (Sherman Granite, Mesoproterozoic, 1.4 Ga; Sybille Canyon, southern Laramie Mountains, southeastern Wyoming, USA) (15002242032).jpg
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[edit]DescriptionGraphic granite (runite) (Sherman Granite, Mesoproterozoic, 1.4 Ga; Sybille Canyon, southern Laramie Mountains, southeastern Wyoming, USA) (15002242032).jpg |
Graphic granite from the Precambrian of Wyoming, USA. Light-colored = K-feldspar (KAlSi3O8 - potassium aluminosilicate) Grayish = quartz (SiO2 - silica) 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: Sherman Granite, Mesoproterozoic, 1.4 Ga Locality: Sybille Canyon, southern Laramie Mountains, southeastern Wyoming, USA |
Date | |
Source | Graphic granite (runite) (Sherman Granite, Mesoproterozoic, 1.4 Ga; Sybille Canyon, southern Laramie Mountains, southeastern Wyoming, 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@N05/15002242032 (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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current | 05:31, 9 October 2019 | 2,999 × 2,249 (343 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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