Foidolite
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/88/Na-bl.jpg/220px-Na-bl.jpg)
Foidolite (sodalitolite variety) from Namibia
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/One_cannot_conquer_alone.jpg/220px-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 phaneritic (coarse-grained) intrusive igneous rock in which more than 60% (by volume) of light-coloured minerals are feldspathoids.[1] 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[]
References[]
- ^ Le Maitre, R.W. (editor) (2002). Igneous Rocks — A Classification and Glossary of Terms (2nd ed.). Cambridge: Cambridge University Press. pp. 4, 22, 24, 82. ISBN 0-521-66215-X.
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has generic name (help)
External links[]
- Foidolite (at University of Manitoba) - Retrieved 2009-05-15
Categories:
- Igneous rocks
- Petrology stubs