Startseite The new K, Pb-bearing uranyl-oxide mineral kroupaite: Crystal-chemical implications for the structures of uranyl-oxide hydroxy-hydrates
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The new K, Pb-bearing uranyl-oxide mineral kroupaite: Crystal-chemical implications for the structures of uranyl-oxide hydroxy-hydrates

  • Jakub Plášil ORCID logo EMAIL logo , Anthony R. Kampf , Travis A. Olds , Jiří Sejkora , Radek Škoda ORCID logo , Peter C. Burns ORCID logo und Jiří Čejka
Veröffentlicht/Copyright: 2. April 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 4

Abstract

Kroupaite (IMA 2017-031), ideally KPb0.5[(UO2)8O4(OH)10]·10H2O, is a new uranyl-oxide hydroxyl-hydrate mineral found underground in the Svornost mine, Jáchymov, Czechia. Electron-probe microanalysis (WDS) provided the empirical formula (K1.28Na0.07)Σ1.35(Pb0.23Cu0.14Ca0.05Bi0.03Co0.02Al0.01)Σ0.48 [(UO2)7.90(SO4)0.04O4.04(OH)10.00]·10H2O, on the basis of 40 O atoms apfu. Sheets in the crystal structure of kroupaite adopt the fourmarierite anion topology, and therefore kroupaite belongs to the schoepite-family of minerals with related structures differing in the interlayer composition and arrangement, and charge of the sheets. Uptake of dangerous radionuclides (90Sr or 135Cs) into the structure of kroupaite and other uranyl-oxide hydroxy-hydrate is evaluated based on crystal-chemical considerations and Voronoi-Dirichlet polyhedra measures. These calculations show the importance of these phases for the safe disposal of nuclear waste.

Keywords: Kroupaite; new mineral species; uranyl-oxide hydroxy-hydrate; crystal structure; Voronoi-Dirichlet polyhedral; 135Cs; 90Sr; Jáchymov

Acknowledgments and Funding

Two anonymous reviewers as well as associate editor and structure editor are thanked for constructive comments, which improved the manuscript. This study was funded, in part, by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County, by the Department of Energy, Basic Energy Sciences, Heavy Elements Program under grant number: DE-FG02-07ER15880, by the Czech Science Foundation (GACR 17-09161S to J.P., J.S., and J.Č.), and by OP VVV project (Geobarr CZ.02.1.01/ 0.0/0.0/16_026/0008459 to R.S.).

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Received: 2019-10-02
Accepted: 2019-11-24
Published Online: 2020-04-02
Published in Print: 2020-04-28

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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  6. Enigmatic diamonds from the Tolbachik volcano, Kamchatka
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  10. Smamite, Ca2Sb(OH)4[H(AsO4)2]·6H2O, a new mineral and a possible sink for Sb during weathering of fahlore
  11. The new K, Pb-bearing uranyl-oxide mineral kroupaite: Crystal-chemical implications for the structures of uranyl-oxide hydroxy-hydrates
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  13. Memorial of Edward J. Olsen 1927–2020
https://doi.org/10.2138/am-2020-7311
Schlagwörter für diesen Artikel
Kroupaite; new mineral species; uranyl-oxide hydroxy-hydrate; crystal structure; Voronoi-Dirichlet polyhedral; 135Cs; 90Sr; Jáchymov

Artikel in diesem Heft

  1. Buoyant rise of anorthosite from a layered basic complex triggered by Rayleigh-Taylor instability: Insights from a numerical modeling study
  2. Chemically oscillating reactions in the formation of botryoidal malachite
  3. Micro- and nano-size hydrogarnet clusters and proton ordering in calcium silicate garnet: Part I. The quest to understand the nature of “water” in garnet continues
  4. Micro- and nano-size hydrogarnet clusters in calcium silicate garnet: Part II. Mineralogical, petrological, and geochemical aspects
  5. Petrogenetic insights from chromite in ultramafic cumulates of the Xiarihamu intrusion, northern Tibet Plateau, China
  6. Enigmatic diamonds from the Tolbachik volcano, Kamchatka
  7. Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition
  8. Mg diffusion in forsterite from 1250–1600 °C
  9. Alteration of magmatic monazite in granitoids from the Ryoke belt (SW Japan): Processes and consequences
  10. Smamite, Ca2Sb(OH)4[H(AsO4)2]·6H2O, a new mineral and a possible sink for Sb during weathering of fahlore
  11. The new K, Pb-bearing uranyl-oxide mineral kroupaite: Crystal-chemical implications for the structures of uranyl-oxide hydroxy-hydrates
  12. Changes in the cell parameters of antigorite close to its dehydration reaction at subduction zone conditions
  13. Memorial of Edward J. Olsen 1927–2020
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