File:Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 7 (48555520767).jpg

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Xenolith in andesite in the Tertiary of Wyoming, USA.

Xenoliths are pieces of rock that have fallen from the walls or roof of a cooling magma chamber, or have become entrained in rising masses of magma ("xeno" means "foreign" and "lith" means "rock"). Xenoliths can occur in intrusive igneous rocks or extrusive igneous rocks (= volcanic lava). The example seen here is in gray-colored andesite. This xenolith is rich in mafic minerals.

Locality: retaining wall block at Corkscrew Bridge overlook, next to Sylvan Pass, Absaroka Mountains, Yellowstone, northwestern Wyoming, USA
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Source Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 7
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@N05/48555520767 (archive). It was reviewed on 9 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 October 2019

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Date/TimeThumbnailDimensionsUserComment
current06:34, 9 October 2019Thumbnail for version as of 06:34, 9 October 20194,000 × 3,000 (7.6 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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