Chemical variability in vyacheslavite, U(PO4)(OH):
Crystal-chemical implications for hydrous and hydroxylated U4+,
Ca, and REE phosphates

J 2022

Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates

STECIUK, Gwladys, Radek ŠKODA, Veronika DILLINGEROVÁ a Jakub PLÁŠIL

Základní údaje

Originální název

Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates

Autoři

STECIUK, Gwladys, Radek ŠKODA (203 Česká republika, domácí), Veronika DILLINGEROVÁ (703 Slovensko, domácí) a Jakub PLÁŠIL (garant)

Vydání

American Mineralogist, Mineralogical Society of America, 2022, 0003-004X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.100

Kód RIV

RIV/00216224:14310/22:00125704

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.2138/am-2021-7875

UT WoS

000736146300013

Klíčová slova anglicky

Vyacheslavite; crystal structure; chemical composition; electron-diffraction tomography; miscibility; rhabdophane; uranium deposits

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 25. 4. 2022 10:24, Mgr. Marie Šípková, DiS.

Anotace

V originále

Particularly interesting chemical variability in the U4+ phosphate mineral vyacheslavite from Menzenschwand (Germany) has been discovered and investigated by means of electron-diffraction and micro-chemical methods. Suggested variability comprises the elevated contents of calcium and rare-earth elements (REEs or Ln). Based on the crystal structure refinement from 3D electron diffraction data, the structural formula of Ca-rich vyacheslavite studied is U0.895Ca0.105 PO4(OH)0.790(H2O)0.210. In general, such compositional variability involving Ca2+ can be expressed as U1–x CaxPO4(OH)1–2x(H2O)2x. Based on detailed electron-probe microanalysis, regions extremely enriched in Y and Ln have been discovered, characterized by the contents up to 11 wt% of Y2O3 and ~4.5 wt% of Ln2O3. In addition to the above-mentioned substitution mechanism, substitution involving Y and Ln can be expressed as U4+ + OH– → REE3+ + H2O. Although the structure refinement has not provided direct evidence of H2O in the studied nano-fragments of vyacheslavite, the presence of H2O and its substitution at OH– sites is a reasonable and necessary charge-balancing mechanism. One H atom site was located during structure refinements; however, an additional H-site is only partially occupied and thus was not revealed from the refinement despite the high-quality data. Substitutional trends observed here suggest possible miscibility or structural relationship between vyacheslavite, rhabdophane, and ningyoite that may depend strongly on OH/H2O content, considering that all crystallize under similar paragenetic conditions.

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

Citovat

STECIUK, Gwladys, Radek ŠKODA, Veronika DILLINGEROVÁ a Jakub PLÁŠIL. Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates. American Mineralogist. Mineralogical Society of America, 2022, roč. 107, č. 1, s. 131-137. ISSN 0003-004X. Dostupné z: https://dx.doi.org/10.2138/am-2021-7875.

@article{1849059,
   author = {Steciuk, Gwladys and Škoda, Radek and Dillingerová, Veronika and Plášil, Jakub},
   article_number = {1},
   doi = {http://dx.doi.org/10.2138/am-2021-7875},
   keywords = {Vyacheslavite; crystal structure; chemical composition; electron-diffraction tomography; miscibility; rhabdophane; uranium deposits},
   language = {eng},
   issn = {0003-004X},
   journal = {American Mineralogist},
   title = {Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates},
   url = {https://pubs.geoscienceworld.org/msa/ammin/article-abstract/107/1/131/610326/Chemical-variability-in-vyacheslavite-U-PO4-OH?redirectedFrom=fulltext},
   volume = {107},
   year = {2022}
}

TY  - JOUR
ID  - 1849059
AU  - Steciuk, Gwladys - Škoda, Radek - Dillingerová, Veronika - Plášil, Jakub
PY  - 2022
TI  - Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates
JF  - American Mineralogist
VL  - 107
IS  - 1
SP  - 131-137
EP  - 131-137
PB  - Mineralogical Society of America
SN  - 0003004X
KW  - Vyacheslavite
KW  - crystal structure
KW  - chemical composition
KW  - electron-diffraction tomography
KW  - miscibility
KW  - rhabdophane
KW  - uranium deposits
UR  - https://pubs.geoscienceworld.org/msa/ammin/article-abstract/107/1/131/610326/Chemical-variability-in-vyacheslavite-U-PO4-OH?redirectedFrom=fulltext
N2  - Particularly interesting chemical variability in the U4+ phosphate mineral vyacheslavite from Menzenschwand (Germany) has been discovered and investigated by means of electron-diffraction and micro-chemical methods. Suggested variability comprises the elevated contents of calcium and rare-earth elements (REEs or Ln). Based on the crystal structure refinement from 3D electron diffraction data, the structural formula of Ca-rich vyacheslavite studied is U0.895Ca0.105 PO4(OH)0.790(H2O)0.210. In general, such compositional variability involving Ca2+ can be expressed as U1–x CaxPO4(OH)1–2x(H2O)2x. Based on detailed electron-probe microanalysis, regions extremely enriched in Y and Ln have been discovered, characterized by the contents up to 11 wt% of Y2O3 and ~4.5 wt% of Ln2O3. In addition to the above-mentioned substitution mechanism, substitution involving Y and Ln can be expressed as U4+ + OH– → REE3+ + H2O. Although the structure refinement has not provided direct evidence of H2O in the studied nano-fragments of vyacheslavite, the presence of H2O and its substitution at OH– sites is a reasonable and necessary charge-balancing mechanism. One H atom site was located during structure refinements; however, an additional H-site is only partially occupied and thus was not revealed from the refinement despite the high-quality data. Substitutional trends observed here suggest possible miscibility or structural relationship between vyacheslavite, rhabdophane, and ningyoite that may depend strongly on OH/H2O content, considering that all crystallize under similar paragenetic conditions.
ER  -

STECIUK, Gwladys, Radek ŠKODA, Veronika DILLINGEROVÁ a Jakub PLÁŠIL. Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates. \textit{American Mineralogist}. Mineralogical Society of America, 2022, roč.~107, č.~1, s.~131-137. ISSN~0003-004X. Dostupné z: https://dx.doi.org/10.2138/am-2021-7875.

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