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File:Nepheline syenite (Ice River Complex, Early Mississippian; southeastern British Columbia, Canada) (14817959949).jpg

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Nepheline syenite from the Early Mississippian-aged Ice River Complex in southeastern British Columbia, Canada. Greenish-gray = nepheline; black = amphibole; yellowish = titanite/sphene. Field of view: 5.2 cm across.

British Columbia’s Ice River Complex has quite a few unusual & scarce igneous rock types (for example, sodalite-aegirine-albite pegmatite and ferrocarbonatite). Here’s a nepheline syenite from the Ice River Complex. This general lithology is commonly observed in & associated with alkaline igneous complexes and carbonatite bodies. Nepheline syenites are alkaline, intermediate intrusive igneous rocks. They lack quartz and K-feldspar and plagioclase feldspar. They are relatively deficient in silica (SiO2) and rich in alkaline elements such as Na and K. The two rock-forming minerals in the sample shown here are nepheline (greenish-gray - (Na,K)AlSiO4) and amphibole (black). Notice there are quite a few scattered yellowish crystals - that’s sphene (a.k.a. titanite - CaTiO(SiO4)).
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Source Nepheline syenite (Ice River Complex, Early Mississippian; southeastern British Columbia, Canada)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14817959949 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current17:56, 7 December 2019Thumbnail for version as of 17:56, 7 December 20191,161 × 715 (152 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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