Saléeite, Mg(UO₂)₂(PO₄)₂, from the Wojcieszyce uranium deposit (Lower Silesia, Poland)

• Autorzy: Siuda R. , Domańska-Siuda J. , Borzęcki R.

Identyfikatory

DOI

10.14241/asgp.2016.009

• Języki publikacji: EN

Abstrakty

EN

The secondary uranium mineral, saléeite, was found in dumps of the former Wojcieszyce Uranium Mine. It occurs as tiny tabular crystals, up to 0.3 cm in size. The chemical formula, which was calculated on the basis of a 12 spot analyses is: (Mg_0.73Fe_0.05K_0.04Ca_0.04)_S0.86(U_O2)_2.16(P_O4)_2.00·10H₂O. The cation position is occupied mainly by Mg. The Mg ions are partially substituted by Fe, K and Ca. The tetrahedral position is occupied by the PO₄^3- ion. The interaction between acidic pore solutions (originating from the reaction of pyrite oxidation), uraninite and minerals of the host rocks (chlorite, apatite) leads to the release of Mg²⁺, UO₂²⁺ and PO₄^3- ions. These ions are adsorbed by amorphous Fe oxyhydroxides and poorly ordered ferrihydrite. Crystallization and recrystallization of these phases leads to the release of adsorbed ions and favours the crystallization of saléeite. The coexistence of saléeite and goethite, which forms by recrystallization of ferrihydrite, points to an important role of sorption and desorption of Mg²⁺, PO₄^3- and UO₂²⁺ ions in the process of crystallization of this mineral species. Crystallization of saléeite occurs at a pH of 5.5–6.0. The supergene zone of the Wojcieszyce deposit is the first occurrence of saléeite in Poland.

Słowa kluczowe

EN

Saléeite; weathering of uraninite; Wojcieszyce

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2016
• Tom: Vol. 86, No. 2
• Strony: 211--218
• Opis fizyczny: Bibliogr. 49 poz., rys., tab., wykr.

Twórcy

autor

Siuda R.

• Faculty of Geology University of Warsaw, Żwirki i Wigury 93, 02-089 Warszawa, Poland

autor

Domańska-Siuda J.

• Faculty of Geology University of Warsaw, Żwirki i Wigury 93, 02-089 Warszawa, Poland

autor

Borzęcki R.

• Mineralogical Museum, Obozowa 4, 57-401 Nowa Ruda, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.