Call number:
D63 (6)
Classification:
Phosphates
Translated title:
Wavellite
Place of origin:
Cornwall, U.K.
Depositional environment:
A secondary mineral of aluminous low-grade metamorphic rocks, in phosphate and limonitic deposits; more rarely as a late-forming hydrothermal vein mineral.
Description:
A secondary mineral found most often in aluminous, low-grade metamorphic rocks. Usually found as radiating "starburst" clusters of green to yellow-green fibrous crystals on fracture surfaces in the matrix, these may grade into globular aggregates; more rarely in chalcedony-like or opaline masses, or stalactic; very rare as good distinct crystals.
Chemical formula:
Al3(PO4)2(OH,F)3*5H2O
Crystal system:
Orthorhombic
Crystal schema:
Dipyramidal
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