Foidolite

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

Weighing the right way

Recognize and detect the effects of electrostatic charges on your balance

How to quickly check pipettes?

Some foidolites are a potential source of aluminium.

See also

• QAPF diagram