Wavellite is an aluminum phosphate mineral. Distinct crystals are rare, and it normally occurs as translucent green radial or spherical clusters.

It occurs in association with crandallite and variscite in fractures in aluminous metamorphic rock, in hydrothermal regions and in phosphate rock deposits. It is found in a wide variety of locations notably in the Mount Ida, Arkansas area in the Ouachita Mountains.

It is sometimes used as a gemstone.