File:Garnetiferous blueschist (Ward Creek, Sonoma County, California, USA) 2.jpg

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English: Garnetiferous blueschist from the Mesozoic of California, USA.

Blueschist (a.k.a. glaucophane schist; a.k.a. glaucophanite) is a scarce, glaucophane-rich rock. It's a classic example of a low-temperature, high-pressure metamorphic rock. The bluish material is the mineral glaucophane (Na2Mg3Al2Si8O22(OH)2 - sodium magnesium hydroxy-aluminosilicate). Calling this lithology a “schist” is misleading, because many samples lack a schistose texture. Blueschist forms by burial metamorphism of basaltic oceanic crust in subduction zones.

This is a crack surface of a gravel clast from a stream in California. It is likely derived from an outcrop in the Mesozoic-aged Franciscan Complex, which is principally a serpentinitic melange. Blueschist "knockers" occur in the complex.

Locality: Ward Creek, western Sonoma County, western California, USA
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Source https://www.flickr.com/photos/47445767@N05/50515152137/
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@N05/50515152137. It was reviewed on 22 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 October 2020

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current18:50, 22 October 2020Thumbnail for version as of 18:50, 22 October 20203,997 × 2,654 (8.82 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50515152137/ with UploadWizard

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