Formula: Fe2+(UO2)2(PO4)2(H2O)10
Hydrated normal phosphate, autunite group
Specific gravity: 3.40 to 3.63
Hardness: 4½
Streak: Pale yellow to greenish white
Colour: Brownish yellow, olive-green, yellow, bronze-yellow

Hydrothermal environments

Bassetite is an uncommon secondary mineral occurring in the oxidised zones of some uranium-bearing hydrothermal mineral deposits (Mindat, HOM). Associated minerals include meta-autunite, metanováčekite, saléeite and torbernite (Mindat).

At Arcu su Linnarbu, Italy, bassetite is associated with meta-autunite and torbernite (HOM).

At the type locality, Wheal Basset, Basset Mines, Carn Brea, Cornwall, England, UK, bassetite is associated with uranospathite, torbernite, uraninite and pyrite (Mindat, HOM) in a pyrite - uraninite vein (Dana).

At the Sue mine, Arizona, USA, bassetite is associated with saléeite and metanováčekite (HOM).

Back to Minerals