Foidolite

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

Foidolite (Template:IPAc-en) 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

  1. ↑ Script error: No such module "citation/CS1".

External links

  • Foidolite (at University of Manitoba) - Retrieved 2009-05-15

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