Wavellite is a classic radiating mineral, forming spectacular pinwheel aggregates emanating from a central core in spherulitic balls. When the balls are complete, the radial structure is internal and not usually visible externally. A crystal radial aggregate needs to be fractured to see and appreciate the outstanding radial habit. Sometimes, due to contact (where specimens have been removed from a pocket or cavity wall), these beautiful radial structures become visible – one of the few occasions when a contact can increase the aesthetics and value of a piece! Its color is characteristically green, but shades of yellow and brown are possible. And when cross-sections are visible, concentric multicolored zoning is typically exhibited.
The crystal system for Wavellite is orthorhombic, typically forming radial aggregates and rounded clusters of spherulitic masses. Other forms include botryoidal, stalactitic, encrusting and acicular.
Quality specimens of Wavellite are found in limited localities, including Bolivia, England, Germany, Ireland and the USA (Arkansas).