Wavellite

wavellite

crandallite

variscite

limonite

Images

Formula: Al3(PO4)2(OH)3.5H2O
Hydrated phosphate with hydroxyl
Specific gravity: 2.36
Hardness: 3½ to 4
Streak: White
Colour: Green to yellowish-green and yellow, greenish white, yellowish-brown, brown, brownish-black, blue, white and colourless; colourless in transmitted light.
Solubility: Readily soluble in acids
Common impurities: F,Fe
Environments:

Sedimentary environments
Metamorphic environments
Hydrothermal environments (rare)

Wavellite is a secondary mineral common in aluminous low-grade metamorphic rocks, in phosphate rock deposits and rarely as a late-formed hydrothermal mineral in veins. Associated minerals include limonite, crandallite and variscite (Dana, HOM).

The type locality is the High Down Quarry, West Buckland, North Devon, Devon, England, UK.

Back to Minerals