mineral

Wavellite (botryoidal/fibrous specimen)

Wavellite, hydrated aluminum phosphate: Al₃(PO₄)₂(OH,F)₃·5H₂O

AI-generated identification · may be incorrect

Typically pale green, gray-green, yellow, or white, with silky to pearly luster and radiating needlelike sprays; Mohs hardness 3.5–4, brittle, with imperfect cleavage and specific gravity about 2.3–2.4. The pictured specimen shows dense fibrous rosettes on a darker host rock.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary phosphate mineral in cavities and fractures of aluminum-rich, phosphate-bearing rocks, often replacing earlier minerals. Most deposits are Paleozoic to younger; notable material occurs in Arkansas, USA, and parts of England, Bolivia, and Australia.

Uses & applications

Primarily a collector mineral; attractive specimens may be cabochon-cut, but its softness and fibrous structure limit jewelry use. It has no major industrial or construction application.

Geological facts

Wavellite commonly forms spectacular radiating “sunburst” or rosette aggregates rather than distinct single crystals. It can resemble earthy turquoise or green fibrous minerals, but its radial sprays and relatively low hardness are diagnostic.

Field identification & locations

Look for fanlike or spherical sprays of fine fibers, pale green color, and a dull-to-silky surface coating a cavity or fracture. Common localities include Garland County, Arkansas; Devon and Cornwall, England; and Western Australia.