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Formula: Fe2+(UO2)2(PO4)2(H2O)10
Hydrated normal uranyl phosphate,
autunite group
Crystal System: Monoclinic
Specific gravity: 3.40 to 3.63
Hardness: 4½
Streak: Pale yellow to greenish white
Colour: Brownish yellow, olive-green, yellow, bronze-yellow
RADIOACTIVE
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, Capoterra, Metropolitan City of Cagliari, Sardinia, Italy, bassetite is associated with
meta-autunite and
torbernite (HOM).
Bassetite from Arcu su Linnarbu - Image
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).
Bassetite from Wheal Basset - Image
At the Sue Mine, Bull Canyon, Asbestos Point area, Sierra Ancha Mining District, Sierra Ancha Mountains, Gila County,
Arizona, USA, bassetite is associated with saléeite and
metanováčekite (HOM).
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