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File:Dacite (Tertiary; Mt. General, San Bernardino County, California, USA) 15.jpg

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Description
English: Dacite from the Tertiary of California, USA.

Dacite is an extrusive igneous rock intermediate in composition between andesite and rhyolite. It has a crystalline texture and is usually porphyritic. The phenocrysts in this sample are moderately small and include quartz (= glassy gray), plagioclase feldspar (= white), and biotite mica (= black).

Locality: Mt. General, Mojave Block, San Bernardino County, southern California, USA
Date
Source https://www.flickr.com/photos/47445767@N05/50506844053/
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@N05/50506844053. It was reviewed on 20 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

20 October 2020

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18 October 2020

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current01:50, 20 October 2020Thumbnail for version as of 01:50, 20 October 20202,682 × 1,942 (3.69 MB)Ser Amantio di NicolaoUploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50506844053/ with UploadWizard

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