Image: Andrew Silver (Public domain)
orthorhombicuncommonPhosphates
Wavellite
Al3(PO4)2(OH,F)3·5H2O
This specimen of Wavellite features distinctive radiating, hemispherical or spherulitic aggregates of acicular crystals, displaying a vibrant yellowish-green color. The individual crystals are too fine to be seen distinctly, forming a botryoidal or globular habit.
Wavellite Physical Properties
Mohs Hardness
3.5Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
Good on {110}Fracture
unevenSpecific Gravity
2.35Colors
green, yellowish-green, white, colorless, brown, blue, blackTransparency
transparentType Locality
Montgomery County, Arkansas, USAMineral Group
PhosphatesUses
collector, minor industrialAssociated Minerals
limonite, variscite, crandallite, turquoiseRarity
uncommonGeological Context
Wavellite is a secondary mineral found in low-grade metamorphic aluminous rocks, phosphate-rich deposits, and limonite beds. It forms from the alteration of other phosphate minerals, often in cracks and fissures.
