File:Porphyritic syenite (Wausau Syenite Complex, Mesoproterozoic; Wausau, Wisconsin, USA) 1 - 52188639980.jpg

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English: Porphyritic syenite from the Precambrian of Wisconsin, USA.

Porphyritic syenite is a crystalline-textured, intrusive igneous rock with a mix of large and small crystals. Syenite has a chemical composition between that of granite's felsic chemistry and gabbro's mafic chemistry. Syenite is an example of an intermediate igneous rock, which has 52 to 65% silica (= SiO2 chemistry) (intermediate has also been defined as 55 to 65% silica). Intermediate igneous rocks are sometimes light-colored, sometimes dark-colored, and sometimes have medium colors.

Syenite is dominated by feldspar with little to no quartz. Syenite is defined as alkali feldspar-rich, with little to no plagioclase feldspar. The minor plagioclase feldspar component is often intergrown with the alkali feldspar to form perthite.

Geologic unit: Wausau Syenite Complex, Mesoproterozoic

Locality: unrecorded / undisclosed site at or near the town of Wausau, Marathon County, north-central Wisconsin, USA
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Source https://www.flickr.com/photos/47445767@N05/52188639980/
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@N05/52188639980. It was reviewed on 6 July 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 July 2022

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current15:43, 6 July 2022Thumbnail for version as of 15:43, 6 July 20222,852 × 2,557 (5.69 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52188639980/ with UploadWizard

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