File:Anorthosite (Lac St. Jean Anorthosite Complex, Mesoproterozoic, 1140-1157 Ma; Lake St-Jean, Quebec, Canada) 1.jpg

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English: Anorthosite from the Precambrian of Quebec, Canada.

Anorthosite is a coarsely-crystalline, intrusive igneous rock dominated by plagioclase feldspar. Pyroxene and other minerals are often present in minor amounts. Anorthosite is an uncommon rock on Earth, but is abundant on the Moon.

The sample seen here is a dark brown anorthosite with labradorite/bytownite and minor pyroxene. It is from the Lac St. Jean Anorthosite Complex, which was emplaced during or just after the Grenvillian Orogeny, an ancient mountain building event that occurred about 1.1 billion years ago.

Geologic unit: Lac St. Jean Anorthosite Suite/Complex, late Mesoproterozoic, 1140 to 1157 Ma

Locality: unrecorded locality at or near Lake St-Jean (Lac St-Jean), central Grenville Province, southern Quebec, southeastern Canada
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Source https://www.flickr.com/photos/47445767@N05/50421609556/
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@N05/50421609556. It was reviewed on 9 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 October 2020

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current06:01, 9 October 2020Thumbnail for version as of 06:01, 9 October 20202,488 × 2,558 (5.27 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50421609556/ with UploadWizard

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