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File:Quartz vein in sandstone (Coleman Quartz Mine, Arkansas, USA) 10.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 picture, the whitish material is a hydrothermal quartz vein of Late Pennsylvanian to Permian age. It has intruded brownish-colored host rocks of quartzose sandstones of the Middle Ordovician Blakely Sandstone.

Location: Coleman Quartz Mine, south of Jessieville, northern Garland County, west-central Arkansas, USA (34º 39.700' North latitude, 93º 06.072' West longitude)
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Source https://www.flickr.com/photos/47445767@N05/51798918210/
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@N05/51798918210. It was reviewed on 28 April 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

28 April 2022

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current14:09, 28 April 2022Thumbnail for version as of 14:09, 28 April 20223,008 × 2,000 (5.17 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51798918210/ with UploadWizard

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