Foidolite
![](../I/m/Na-bl.jpg)
Foidolite (sodalitolite variety) from Namibia
![](../I/m/One_cannot_conquer_alone.jpg)
Thin section of foidolite under polarizing microscope. In the foreground there is a large yellow sodium pyroxene grain surrounded by fine grains.
Foidolite ( /ˈfɔɪdəlaɪt/) is a rare coarse-grained intrusive igneous rock with a feldspathoid mineral content greater than 60%. Crystals of alkali feldspar, plagioclase, biotite, amphibole, pyroxene, and/or olivine may be present within the rock. The volcanic equivalents are termed foidite and phonolitic or tephritic foidites.
Some foidolites are a potential source of aluminium.
See also
External links
- Foidolite (at University of Manitoba) - Retrieved 2009-05-15
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.