Foidolite

Foidolite () is a rare coarse-grained intrusive igneous rock in which more than 60% (by volume) of light-coloured minerals are feldspathoids. 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.