Foidite

Foidolite

Foidolite

Igneous rock rich in feldspathoid minerals

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.

Foidolite (sodalitolite variety) from Namibia
Thin section of foidolite under polarizing microscope. In the foreground there is a large yellow sodium pyroxene grain surrounded by fine grains.

Some foidolites are a potential source of aluminium.

See also

References

  1. [1]
    Le Maitre, R.W., ed. (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.
  • Foidolite (at University of Manitoba) - Retrieved 2009-05-15


Stub icon

This igneous rock-related article is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article Foidite, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.