File:Quartzite (Precambrian; Rock Creek Canyon, Beartooth Mountains, Montana, USA) 9.jpg

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English: Quartzite from the Precambrian of Montana, USA. (~3.7 cm across at its widest)

Quartzite is a crystalline-textured, intermediate- to high-grade metamorphic rock composed of quartz (SiO2 - silicon dioxide). It forms by metamorphic alteration of quartzose sandstones. This sample is from the Precambrian of Montana's Beartooth Mountains, which are dominated by Archean metamorphics. The dark greenish color is from disseminated fuchsite (= chromian muscovite mica).

Locality: loose piece along Hellroaring Road (Forest Service Road 2004), northwestern side of Rock Creek Canyon, southeast of Hellroaring Lakes & southwest of the town of Red Lodge, Beartooth Mountains, southern Montana, USA
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Source https://www.flickr.com/photos/47445767@N05/31263008522/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31263008522. It was reviewed on 7 August 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 August 2020

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current02:41, 7 August 2020Thumbnail for version as of 02:41, 7 August 20202,007 × 1,369 (1.87 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/31263008522/ with UploadWizard

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