File:Metanorthosite (Mesoproterozoic, ~1.15 Ga; Cranberry Lake, New York State, USA) 1.jpg

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English: Metanorthosite from the Precambrian of New York State, USA. (~18.8 cm across at its widest)

Anorthosite is a coarsely-crystalline, intrusive igneous rock dominated by plagioclase feldspar - typically labradorite. A major occurrence of this uncommon rock is in the Adirondack Mountains of New York State. In this area, the rocks have been regionally metamorphosed, but the overall mineralogy is the same. The dark bluish-gray crystals are plagioclase phenocrysts. The lighter-colored areas are finely-crystalline groundmass, also composed of plagioclase.

Locality: float block (transported) at Cranberry Lake, southeastern St. Lawrence County, northwestern Adirondack Mountains, northern New York State, USA


See info. at:

en.wikipedia.org/wiki/Anorthosite
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Source https://www.flickr.com/photos/47445767@N05/48751302738/
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@N05/48751302738. 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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current05:58, 9 October 2020Thumbnail for version as of 05:58, 9 October 20203,492 × 2,748 (6.31 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/48751302738/ with UploadWizard

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