Hydrated phosphate, uranium mineral, phosphuranylite group
Specific gravity: 5.03
Hardness: 2.5 to 3
Streak: Light yellow
Solubility: Radioactive. Soluble in acids.
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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