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Foidolite (pronounced /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.
Additional recommended knowledge
Some foidolites are a potential source of aluminium.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Foidolite". A list of authors is available in Wikipedia.|