File:Anorthosite with labradorite (Wiborg Batholith, 1633 Ma; Kymi Province, Finland) 4.jpg

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English: Anorthosite from the Precambrian of Finland.

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 has very large crystals of labradorite, a type of plagioclase feldspar that often shows a rainbow play of colors. This comes from a gabbro-anorthosite body in Finland's Wiborg Batholith. Mineral percentages reported from the intrusion: 81% labradorite, 10% pyroxene, 4% quartz, and 5% other minerals. I don't see pyroxene in this sample, so I'm calling it anorthosite. If the specimen had less than 90% labradorite, it would be a gabbroic anorthosite.

Geologic unit: 1 x 2 square kilometer gabbro-anorthosite body in the central Wiborg Batholith, Baltic Shield/Fennoscandian Shield, late Paleoproterozoic, 1.633 Ga

Locality: attributed to a quarry at Ylijärvi (= Geological Survey of Finland map 3133, sheet 1, grid coordinates 6740.20-35467.50), ~6 kilometers southwest of Ylämaa village, southern Kymi Province, southern Finland
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Source https://www.flickr.com/photos/47445767@N05/50420371481/
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@N05/50420371481. 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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current06:00, 9 October 2020Thumbnail for version as of 06:00, 9 October 20203,425 × 2,443 (6.8 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50420371481/ with UploadWizard

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