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File:Quartz vein in sandstone (Coleman Quartz Mine, Arkansas, USA) 1.jpg

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English: Hydrothermal vein quartz (SiO2) intruding quartzose sandstone at the Coleman Quartz Mine in Arkansas, USA.

The Ouachita Mountains of Arkansas were formed during the Late Paleozoic Ouachita Orogeny. That mountain forming event was accompanied by the intrusion of hydrothermal quartz veins in some areas. The Coleman Quartz Mine allows for close examination and collection of spectacular quartz crystals from these veins.

In the above photo, the whitish material is a hydrothermal quartz vein of Late Pennsylvanian to Permian age. It has intruded brownish-colored host rocks of quartzose sandstones (quartz arenites) of the Middle Ordovician Blakely Sandstone.

Location: Coleman Quartz Mine, south of Jessieville, northern Garland County, west-central Arkansas, USA (34º 39.700' North, 93º 06.072' West)
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Source https://www.flickr.com/photos/47445767@N05/8290509151/
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@N05/8290509151. It was reviewed on 22 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 December 2021

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current16:47, 22 December 2021Thumbnail for version as of 16:47, 22 December 2021960 × 649 (500 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/8290509151/ with UploadWizard

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