Formula: H2Pb3(UO2)6O4(PO4)4.12H2O
Hydrated phosphate, uranium mineral, phosphuranylite group
Specific gravity: 5.03
Hardness: 2.5 to 3
Streak: Light yellow
Colour: Canary-yellow
Solubility: Radioactive. Soluble in acids.

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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