Wavellite

secondary mineral

metamorphic

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
Environments:

Sedimentary environments
Metamorphic environments
Hydrothermal vein environment (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 (Dana).
Common impurities: F,Fe

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