File:Quartz vein in sandstone (Coleman Quartz Mine, Arkansas, USA) 5.jpg

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English: Hydrothermal vein quartz (SiO2) intruding quartzose sandstone from the Coleman Quartz Mine in Arkansas, USA. (4.1 centimeters tall)

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 sample seen here, the whitish material is a hydrothermal quartz vein of Late Pennsylvanian to Permian age. The brown-colored host rock is quartzose sandstone (quartz arenite) 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@N05/51020928073/
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@N05/51020928073. It was reviewed on 11 March 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

11 March 2021

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current21:11, 11 March 2021Thumbnail for version as of 21:11, 11 March 20211,807 × 2,302 (3.02 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51020928073/ with UploadWizard

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