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Formula: Fe2+Fe3+(U6+O2)4(PO4)4(OH).12-13H2O
Hydrated phosphate, uranyl mineral
Crystal System: Monoclinic
Specific gravity: 3.650 measured, 3.663 calculated
Hardness: 2½
Streak: Pale brown
Colour: Bronze-brown
Very strongly RADIOACTIVE
Environments
Localities
At the type locality, Wheal Basset, Basset Mines, Carnkie, Carn Brea, Cornwall, England, UK, vochtenite is a
rare secondary mineral in the oxidised zone of a
uranium-bearing
copper-tin hydrothermal mineral deposit.
It is associated with bassetite
(HOM).
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