Chemical variability in vyacheslavite, U(PO.sub.4./sub.)(OH): Crystal-chemical implications for hydrous and hydroxylated U.sup.4+./sup., Ca, and REE phosphates

0553433 - FZÚ 2023 RIV US eng J - Journal Article
Steciuk, Gwladys - Škoda, R. - Dillingerová, V. - Plášil, Jakub
Chemical variability in vyacheslavite, U(PO₄)(OH): Crystal-chemical implications for hydrous and hydroxylated U⁴⁺, Ca, and REE phosphates.
American Mineralogist. Roč. 107, č. 1 (2022), s. 131-137. ISSN 0003-004X. E-ISSN 1945-3027
R&D Projects: GA ČR(CZ) GA20-11949S
Institutional support: RVO:68378271
Keywords : vyacheslavite * crystal structure * chemical composition * electron-diffraction tomography * miscibility * rhabdophane * uranium deposits
OECD category: Mineralogy
Impact factor: 3.1, year: 2022
Method of publishing: Limited access
https://doi.org/10.2138/am-2021-7875

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 U0.895Ca0.105PO4(OH)0.790(H2O)0.210.
Permanent Link: http://hdl.handle.net/11104/0330537