ISSN

print 2570-7337
online 2570-7345

New data on uranyl minerals from Selce occurrence at Banská Bystrica (North Veporicum Unit, Slovak Republic)


Volume 25, issue 2 (2017), pages 162-169

Keywords

Abstract

This work deals with some new data on uranyl minerals from the Selce occurrence at Banská Bystrica (Slovak Republic). They were identified in Permian arkoses containing primary uranium and copper mineralization located in the Northern Veporicum Unit (Špania Dolina Formation). Boltwoodite forms extremely thin crystalline coatings (up to 0.5 mm in size), with macroscopically atypical light to dark blue or typical yellow colour. It forms irregularly arranged prismatic crystals too. Boltwoodite was identified by EPMA-WDS, its average chemical composition is: (K0.77Ca0.10Fe0.01Na0.01)Σ0.89(UO2)1.13[(SiO3 OH)1.02(SO4)0.01]∑1.03·1.5(H2O). Metasaléeite forms light yellow crystalline coatings and clumps (up to 1 mm in size). Metasaléeite was identified by X-ray powder diffraction, the mainly diffraction maxima are 8.855(100), 4.427(21.2) and 2.215(2.1). Its refined unit cell parameters are: a 7.212(3), c 17.707(3) Å and V 921.05(1) Å3. Uranophane forms globular aggregates (up to 0.15 mm in size), consist of fibrous, needle like crystals resp. cryptocrystalline coatings and crusts of yellow colour. Its average chemical composition is: (Ca0.80K0.13Fe0.04Zn0.01Na0.01Ba0.01Cu0.01)Σ1.01(UO2)2.04[(SiO3OH)1.87(AsO4)0.03(PO4)0.02(SO4)0.02]∑1.94·5(H2O). Zeunerite was identified by EPMA-WDS, its average chemical composition is: (Cu0.57Fe0.12K0.05Al0.02Zn0.01Na0.01Sr0.01)Σ0.79(UO2)2.04[(AsO4)1.78(PO4)0.12(SiO4)0.09(SO4)0.01]Σ2.00·12H2O. It forms idiomorphic to hypidiomorphic tabular crystals (up to 0.1 mm in size). Boltwoodite and metasaléeite were identified in Slovakia for the first time. The source of K and Ca for the formation of uranyl silicates was leached rockforming minerals (feldspars, micas). The source of Cu and As for the zeunerite were weathering sulphide minerals (chalcopyrite, tetrahedrite and arsenopyrite).

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References

Cassedanne J, Cassedanne J, De carvalho H (1986) ICDD Card No 41-1389. An Acad Bras Cienc 58: 249

Čejka J, Urbanec Z (1990) Secondary uranium minerals: The Mineralogy, Geochemistry and Crystal Chemistry of the Secondary Uranium (VI) Minerals. 68-70, Academia, Nakladatelství ČSAV, Praha

Ferenc Š, Rojkovič I, Maťo Ľ (2003) Uranylové minerály Západných Karpát. Zbor Mineralogie Českého masívu a Západných Karpát, 17-23. Vyd Univerzita Palackého, Olomouc

Finch RJ, Ewing RC (1992) The corrosion of uraninite under oxidizing conditions. Jour Nuc Matt 190: 133-156

Heinrich EW (1958) Mineralogy and geology of radioactive raw materials. 1-654, McGrawhill book company, USA

Holland TJB, Redfern SAT (1997) Unit cell refinement from powder diffraction data: the use of regression diagnostics. Mineral Mag 61: 65-77

Chernikov AA (1981) Behaviour of uranium in supergene zone. 1-208, Nedra, Moscow

Kopáčik R, Ferenc Š (2016) Sabugalit z lokality Brezno-Skalka (stredné Slovensko). Minerál 24: 297-300

Krivovichev SV, Plášil J (2013) Mineralogy and crystallography of uranium. In From Crandle to Grave 15-119. Min Assoc of Can Short Cour

Novotný L (1970) Zápisky o výskyte uránovej mineralizácie v Selčianskej doline. Terénny denník. Nestránkované

Ondruš P (1993) ZDS - A computer program for analysis of X-ray powder diffraction patterns. Materials Science Forum, 133-136, 297-300, EPDIC-2. Enchede.

Plášil J (2014) Oxidation-hydration weathering of uraninite: the current state of knowledge. J Geosci 59: 99-114

Plášil J, Sejkora J, Čejka J, Pavlíček R, Babka K, Škoda R (2016) Výskyt boltwooditu na uranovém ložisku Kladská (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 24: 298-303

Plášil J, Sejkora J, Čejka J, Škoda R, Goliáš V (2009) Supergene mineralization of the Medvědín uranium deposit, Krkonoše Mountains, Czech Republic. J Geosci 54: 15-56

Polák Ľ (2016) Uránová mineralizácia v Selciach pri Banskej Bystrici. Minerál 24: 118-122

Polák Ľ, Ferenc Š (2016) Primárna-uránovo medená mineralizácia v Selciach pri Banskej Bystrici. Zbor konferencie Nerastné suroviny v 21. storočí, 44-45. Vyd PRIF UK Bratislava

Polák Ľ, Ferenc Š, Biroň A, Sýkorová M (2016) Uranofán zo Seliec pri Banskej Bystrici (Starohorské vrchy, Slovenská republika). Bull mineral-petrolog Odd Nár Muz (Praha) 24: 178-182

Polák Ľ, Ferenc Š, Olšavský M (2015) Výskyt uránovej mineralizácie v Selciach pri Banskej Bystrici. Zbor Mineralogicko-petrologickej konferencie Petros, 28-31. Vyd PRIF UK Bratislava

Rojkovič I (1997) Uranium mineralization in Slovakia. 1-117, Acta geol Univ Comen, Bratislava

Rojkovič I, Novotný L (1993) Uránová mineralizácia v tatriku a veporiku. Miner Slov 25: 341-348

Sejkora J, Čejka J, Šrein V (2007) Supergene uranium mineralization from Horní Halže near Měděnec (Krušné hory Mountains), Czech Republic. J Geosci 52: 199-210

Stohl FV, Smith DK (1981) The crystal chemistry of the uranyl silicate minerals. Am Mineral 66: 610-625

Števko M (2014) Mineralogická charakteristika supergénnych arzeničnanov medi z lokalít Novoveská Huta, Poniky a Špania Dolina. Dizertačná práca, PRÍK UK, Bratislava

Števko M, Sejkora J, Plášil J (2012) Supergénna uránová mineralizácia na ložisku Banská Štiavnica (Slovenská republika). Bull mineral-petrolog Odd Nár Muz (Praha) 20: 110-120

Tréger M (1961) Rukopisné poznámky o prieskume U anomálií v oblasti Španej doliny. MS, Spišská Nová Ves. Nestránkované

Vinogradov AP (1963) Osnovnie čerty geochimii urana. 1-351, Akademia nauk SSSR, Moskva

Vozárová A, Vozár J (1988) Late Paleozoic in Western Carpathians. 1-314, ŠGÚDŠ, Bratislava