File:Nepheline syenite (questionably from Wausau, Wisconsin, USA).jpg
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| Description |
English: Nepheline syenite, possibly from the Precambrian of Wisconsin, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)
Nepheline syenite is a crystalline-textured, alkaline, intrusive igneous rock. Unlike an ordinary syenite, this rock has an appreciable nepheline content. Nepheline is a feldspathoid mineral - a "feldspar-like mineral". Feldspathoids have more aluminum and less silicon than the feldspars. They are less stable than feldspars and usually decompose in strong acids - they don't effervesce, but become gels. Nepheline is an aluminum-rich version of sodium feldspar - it has the chemical formula NaAlSiO4 (sodium aluminosilicate). The formula has also been cited as (Na,K)AlSiO4 (sodium potassium aluminosilicate). Nepheline has a nonmetallic luster, is usually whitish to grayish in color, is moderately hard (H = 5.5 to 6 on the Mohs Hardness Scale), forms hexagonal crystals, and has poor cleavage. It is an important rock-forming mineral in many syenites. It is usually mixed with albite feldspar (= sodium feldspar, NaAlSi3O8). Geologic unit & locality: unknown, but possibly from the Mesoproterozoic-aged Wausau Syenite Complex of Wisconsin, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/40770729774/ |
| 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@N05/40770729774. It was reviewed on 3 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 19:55, 3 December 2020 | | 1,825 × 1,247 (1.87 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/40770729774/ with UploadWizard |
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