Extending the mineralogy of U6+ (I): Crystal structure of
lepersonnite-(Gd) and a description of the new mineral
lepersonnite-(Nd)

J 2025

Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd)

PLASIL, Jakub; Gwladys STECIUK; Jiri SEJKORA; Anthony R. KAMPF; Pavel UHER et al.

Základní údaje

Originální název

Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd)

Autoři

PLASIL, Jakub; Gwladys STECIUK; Jiri SEJKORA; Anthony R. KAMPF; Pavel UHER; Martin ONDREJKA; Radek ŠKODA; Zdenek DOLNICEK; Simon PHILIPPO; Mael GUENNOU; Nicolas MEISSER; Jan ROHLICEK a Florias MEES

Vydání

MINERALOGICAL MAGAZINE, CAMBRIDGE, CAMBRIDGE UNIV PRESS, 2025, 0026-461X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.400 v roce 2024

Označené pro přenos do RIV

Ano

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

lepersonnite-(Gd); lepersonnite-(Nd); rare-earth elements; new mineral; crystal structure; 3D electron diffraction; complexity

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 15. 1. 2026 10:43, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Two uranyl carbonate silicate minerals have been studied in detail, lepersonnite-(Gd) and the new mineral lepersonnite-(Nd). Both minerals originate from Katanga province in the Democratic Republic of Congo (Africa): lepersonnite-(Gd) from the Shinkolobwe mine (type locality) and lepersonnite-(Nd) from the Swambo mine (type locality) and Shinkolobwe mine. Each occurs as radial to acicular aggregates composed of long prismatic, thin crystals, as the products of hydration-oxidation weathering of uraninite. A detailed description of the chemical and physical properties of lepersonnite-(Nd) is provided, including the thermal analysis of the -(Gd) member. Moreover, Raman and infrared spectroscopy data are provided for both minerals. The crystal structure of lepersonnite-(Gd) has been solved based on 3D electron diffraction data. According to the best dataset at 95 K, lepersonnite-(Gd) is orthorhombic, with a = 11.838(134) & Aring;, b = 15.822(333) & Aring;, c = 39.147(190) & Aring; and V = 7353(282) & Aring;3 (Z = 4). The dynamic refinement of the crystal structure (Robs/wRobs = 0.1204/0.1088 and Rall/wRall = 0.1204/0.1088 for 3090/50507 observed/all reflections and 247 refined parameters) revealed a large complex sheet structure with structural units defining a new lepersonnite topology. It contains infinite sheets of uranyl polyhedra, planar CO3 groups, protonated Si-tetrahedra, and Gd3+ polyhedra, and a thick interlayer hosted with H2O and partially occupied Ca2+ sites. Based on the structure refinement, bond-valence considerations, and new electron microprobe data, we infer that the ideal formula of lepersonnite-(Gd) is [Ca0.5Gd0.5(H2O)18(OH)1.5] [Gd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5]. On the basis of their closely related powder X-ray diffraction patterns and the similar behaviour of Nd and Gd, we expect the two minerals to adopt the same structures, apart from Ca, which was absent in lepersonnite-(Nd). The ideal formula for lepersonnite-(Nd) is [Nd(H2O)18(OH)2][Nd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5].

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

90251, velká výzkumná infrastruktura

Název: CzechNanoLab II

Citovat

PLASIL, Jakub; Gwladys STECIUK; Jiri SEJKORA; Anthony R. KAMPF; Pavel UHER; Martin ONDREJKA; Radek ŠKODA; Zdenek DOLNICEK; Simon PHILIPPO; Mael GUENNOU; Nicolas MEISSER; Jan ROHLICEK a Florias MEES. Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd). MINERALOGICAL MAGAZINE. CAMBRIDGE: CAMBRIDGE UNIV PRESS, 2025, roč. 89, č. 5, s. 549-565. ISSN 0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2025.29.

@article{2547300,
   author = {Plasil, Jakub and Steciuk, Gwladys and Sejkora, Jiri and Kampf, Anthony R. and Uher, Pavel and Ondrejka, Martin and Škoda, Radek and Dolnicek, Zdenek and Philippo, Simon and Guennou, Mael and Meisser, Nicolas and Rohlicek, Jan and Mees, Florias},
   article_location = {CAMBRIDGE},
   article_number = {5},
   doi = {https://doi.org/10.1180/mgm.2025.29},
   keywords = {lepersonnite-(Gd); lepersonnite-(Nd); rare-earth elements; new mineral; crystal structure; 3D electron diffraction; complexity},
   language = {eng},
   issn = {0026-461X},
   journal = {MINERALOGICAL MAGAZINE},
   title = {Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd)},
   url = {https://doi.org/10.1180/mgm.2025.29},
   volume = {89},
   year = {2025}
}

TY  - JOUR
ID  - 2547300
AU  - Plasil, Jakub - Steciuk, Gwladys - Sejkora, Jiri - Kampf, Anthony R. - Uher, Pavel - Ondrejka, Martin - Škoda, Radek - Dolnicek, Zdenek - Philippo, Simon - Guennou, Mael - Meisser, Nicolas - Rohlicek, Jan - Mees, Florias
PY  - 2025
TI  - Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd)
JF  - MINERALOGICAL MAGAZINE
VL  - 89
IS  - 5
SP  - 549-565
EP  - 549-565
PB  - CAMBRIDGE UNIV PRESS
SN  - 0026461X
KW  - lepersonnite-(Gd)
KW  - lepersonnite-(Nd)
KW  - rare-earth elements
KW  - new mineral
KW  - crystal structure
KW  - 3D electron diffraction
KW  - complexity
UR  - https://doi.org/10.1180/mgm.2025.29
N2  - Two uranyl carbonate silicate minerals have been studied in detail, lepersonnite-(Gd) and the new mineral lepersonnite-(Nd). Both minerals originate from Katanga province in the Democratic Republic of Congo (Africa): lepersonnite-(Gd) from the Shinkolobwe mine (type locality) and lepersonnite-(Nd) from the Swambo mine (type locality) and Shinkolobwe mine. Each occurs as radial to acicular aggregates composed of long prismatic, thin crystals, as the products of hydration-oxidation weathering of uraninite. A detailed description of the chemical and physical properties of lepersonnite-(Nd) is provided, including the thermal analysis of the -(Gd) member. Moreover, Raman and infrared spectroscopy data are provided for both minerals. The crystal structure of lepersonnite-(Gd) has been solved based on 3D electron diffraction data. According to the best dataset at 95 K, lepersonnite-(Gd) is orthorhombic, with a = 11.838(134) & Aring;, b = 15.822(333) & Aring;, c = 39.147(190) & Aring; and V = 7353(282) & Aring;3 (Z = 4). The dynamic refinement of the crystal structure (Robs/wRobs = 0.1204/0.1088 and Rall/wRall = 0.1204/0.1088 for 3090/50507 observed/all reflections and 247 refined parameters) revealed a large complex sheet structure with structural units defining a new lepersonnite topology. It contains infinite sheets of uranyl polyhedra, planar CO3 groups, protonated Si-tetrahedra, and Gd3+ polyhedra, and a thick interlayer hosted with H2O and partially occupied Ca2+ sites. Based on the structure refinement, bond-valence considerations, and new electron microprobe data, we infer that the ideal formula of lepersonnite-(Gd) is [Ca0.5Gd0.5(H2O)18(OH)1.5] [Gd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5]. On the basis of their closely related powder X-ray diffraction patterns and the similar behaviour of Nd and Gd, we expect the two minerals to adopt the same structures, apart from Ca, which was absent in lepersonnite-(Nd). The ideal formula for lepersonnite-(Nd) is [Nd(H2O)18(OH)2][Nd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5].
ER  -

PLASIL, Jakub; Gwladys STECIUK; Jiri SEJKORA; Anthony R. KAMPF; Pavel UHER; Martin ONDREJKA; Radek ŠKODA; Zdenek DOLNICEK; Simon PHILIPPO; Mael GUENNOU; Nicolas MEISSER; Jan ROHLICEK a Florias MEES. Extending the mineralogy of U6+ (I): Crystal structure of lepersonnite-(Gd) and a description of the new mineral lepersonnite-(Nd). \textit{MINERALOGICAL MAGAZINE}. CAMBRIDGE: CAMBRIDGE UNIV PRESS, 2025, roč.~89, č.~5, s.~549-565. ISSN~0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2025.29.

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