Wavellite is a phosphate mineral. Distinct crystals are rare, and it normally occurs as translucent green radial or spherical clusters.
Wavellite was first described in 1805 for an occurrence at High Down, Filleigh, Devon, England and named for William Wavell of England who brought the mineral to the attention of fellow-mineralogists.
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.