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Formula: H2Pb3(UO2)6O4(PO4)4.12H2O
Hydrated uranyl phosphate,
phosphuranylite group
Crystal System: Orthorhombic
Specific gravity: 5.03 measured, 5.12 calculated
Hardness: 2.5 to 3
Streak: Light yellow
Colour: Canary-yellow
Solubility: Soluble in acids.
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Dewindtite is a rare secondary mineral derived from the
alteration of
uraninite or predecessor
secondary uranium
minerals
(Mindat, Webmin, HOM).
Associated minerals include uraninite,
uranophane and
uranosphaerite
(Mindat)
At the type locality, the Shinkolobwe Mine, Kambove District, Haut-Katanga, Democratic Republic of the Congo,
dewindtite is associated with torbernite,
parsonsite, dumontite and
uraninite (HOM, Mindat), inter-layered with
metatorbernite (AM 39.444-447).
At The Streuberg, Germany, dewindtite is associated with bergenite,
torbernite, autunite,
uranocircite and barium-rich
uranophane (HOM)
At Kers ́egalec-en-Lignol, France, dewindtite is associated with
uranosphaerite,
wölsendorfite
and uraninite (HOM)
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