File:Syenite dike in anorthosite (Whiteface Anorthosite, Mesoproterozoic, ~1155 Ma; near Franklin Falls, New York, USA) 2.jpg

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English: Syenite dike in anorthosite from the Precambrian of New York State, USA. (public display, Limper Geology Museum, Miami University, Oxford, Ohio, USA)

The cut-and-polished slab shown above is from the Adirondack Mountains of New York State. Adirondacks bedrock is dominated by anorthosite of Precambrian age. Anorthosite is an uncommon, crystalline-textured, intrusive igneous rock dominated by calcium-rich plagioclase feldspar (usually grayish-colored) plus minor blackish-colored pyroxene. The mostly gray material at the top and bottom of the slab is anorthosite. Much of the pyroxene in this sample occurs as elongated patches, which is the result of regional metamorphism. Technically, the gray rock is not anorthosite (crystalline-textured & igneous), but metanorthosite (coarsely-crystalline or foliated & metamorphic). The foliated texture in this rock is weakly developed.

The band of multicolored rock running through the metanorthosite is a syenite dike. Syenite is a coarsely-crystalline, intrusive igneous rock dominated by sodium-rich plagioclase feldspar (oligoclase), plus minor calcium-rich plagioclase feldspar, hornblende amphibole, and quartz.

Geologic unit: Whiteface Anorthosite, Mesoproterozoic, ~1155 Ma

Locality: near Franklin Falls, Adirondack Mountains, northern New York, USA
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Source https://www.flickr.com/photos/47445767@N05/25383152333/
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@N05/25383152333. 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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current05:57, 9 October 2020Thumbnail for version as of 05:57, 9 October 20203,008 × 2,000 (3.16 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/25383152333/ with UploadWizard

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