Hidden and apparent twins in uranyl-oxide minerals agrinierite
and rameauite: a demonstration of metric and reticular
merohedry

J 2021

Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry

PLÁŠIL, Jakub; Václav PETŘÍČEK; Radek ŠKODA; Nicolas MEISSER; Anatoly V. KASATKIN et. al.

Základní údaje

Originální název

Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry

Autoři

PLÁŠIL, Jakub (garant); Václav PETŘÍČEK; Radek ŠKODA (203 Česká republika, domácí); Nicolas MEISSER a Anatoly V. KASATKIN

Vydání

Journal of Applied Crystallography, International Union of Crystallography, 2021, 1600-5767

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: 4.868

Kód RIV

RIV/00216224:14310/21:00123492

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1107/S1600576721009663

UT WoS

000727770700013

EID Scopus

2-s2.0-85131185687

Klíčová slova anglicky

agrinierite; rameauite; twinning; merohedry; Jana2020

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 11. 7. 2023 09:27, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

In this work, the structures of chemically related uranyl-oxide minerals agrinierite and rameauite have been revisited and some corrections to the available structure data are provided. Both structures were found to be twinned. The two minerals are chemically similar, and though their structures differ considerably, their unit-cell metrics are similar. Agrinierite was found to be twinned by metric merohedry (diffraction type I), whereas the structure of rameauite is twinned by reticular merohedry (diffraction type II). The twinning of the monoclinic unit cells (true cells) leads to pseudo-orthorhombic or pseudo-tetragonal supercells in the single-crystal diffraction patterns of both minerals. According to the new data and refinement, agrinierite is monoclinic (space group Cm), with a = 14.069 (3), b = 14.220 (3), c = 13.967 (3) Å, β = 120.24 (12)° and V = 2414.2 (12) Å3 (Z = 2). The twinning can be expressed as a mirror in (101) (apart from the inversion twin), which leads to a supercell with a = 14.121, b = 14.276, c = 24.221 Å and V = 2 × 2441 Å3, which is F centered. The new structure refinement converged to R = 3.54% for 6545 unique observed reflections with I > 3σ(I) and GOF = 1.07. Rameauite is also monoclinic (space group Cc), with a = 13.947 (3), b = 14.300 (3), c = 13.888 (3) Å, β = 118.50 (3)° and V = 2434.3 (11) Å3 (Z = 2). The twinning can be expressed as a mirror in (101) (apart from the inversion twin), which leads to a supercell with a = 14.223, b = 14.300, c = 23.921 Å and V = 2 × 2434 Å3, which is C centered. The new structure refinement of rameauite converged to R = 4.23% for 2344 unique observed reflections with I > 3σ(I) and GOF = 1.48. The current investigation documented how peculiar twinning can be, not only for this group of minerals, and how care must be taken in handling the data biased by twinning.

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

Citovat

PLÁŠIL, Jakub; Václav PETŘÍČEK; Radek ŠKODA; Nicolas MEISSER a Anatoly V. KASATKIN. Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry. Journal of Applied Crystallography. International Union of Crystallography, 2021, roč. 54, č. 6, s. 1656-1663. ISSN 1600-5767. Dostupné z: https://doi.org/10.1107/S1600576721009663.

@article{1816620,
   author = {Plášil, Jakub and Petříček, Václav and Škoda, Radek and Meisser, Nicolas and Kasatkin, Anatoly V.},
   article_number = {6},
   doi = {https://doi.org/10.1107/S1600576721009663},
   keywords = {agrinierite; rameauite; twinning; merohedry; Jana2020},
   language = {eng},
   issn = {1600-5767},
   journal = {Journal of Applied Crystallography},
   title = {Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry},
   url = {https://journals.iucr.org/j/issues/2021/06/00/vb5019/},
   volume = {54},
   year = {2021}
}

TY  - JOUR
ID  - 1816620
AU  - Plášil, Jakub - Petříček, Václav - Škoda, Radek - Meisser, Nicolas - Kasatkin, Anatoly V.
PY  - 2021
TI  - Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry
JF  - Journal of Applied Crystallography
VL  - 54
IS  - 6
SP  - 1656-1663
EP  - 1656-1663
PB  - International Union of Crystallography
SN  - 16005767
KW  - agrinierite
KW  - rameauite
KW  - twinning
KW  - merohedry
KW  - Jana2020
UR  - https://journals.iucr.org/j/issues/2021/06/00/vb5019/
N2  - In this work, the structures of chemically related uranyl-oxide minerals agrinierite and rameauite have been revisited and some corrections to the available structure data are provided. Both structures were found to be twinned. The two minerals are chemically similar, and though their structures differ considerably, their unit-cell metrics are similar. Agrinierite was found to be twinned by metric merohedry (diffraction type I), whereas the structure of rameauite is twinned by reticular merohedry (diffraction type II). The twinning of the monoclinic unit cells (true cells) leads to pseudo-orthorhombic or pseudo-tetragonal supercells in the single-crystal diffraction patterns of both minerals. According to the new data and refinement, agrinierite is monoclinic (space group Cm), with a = 14.069 (3), b = 14.220 (3), c = 13.967 (3) Å, β = 120.24 (12)° and V = 2414.2 (12) Å3 (Z = 2). The twinning can be expressed as a mirror in (101) (apart from the inversion twin), which leads to a supercell with a = 14.121, b = 14.276, c = 24.221 Å and V = 2 × 2441 Å3, which is F centered. The new structure refinement converged to R = 3.54% for 6545 unique observed reflections with I > 3σ(I) and GOF = 1.07. Rameauite is also monoclinic (space group Cc), with a = 13.947 (3), b = 14.300 (3), c = 13.888 (3) Å, β = 118.50 (3)° and V = 2434.3 (11) Å3 (Z = 2). The twinning can be expressed as a mirror in (101) (apart from the inversion twin), which leads to a supercell with a = 14.223, b = 14.300, c = 23.921 Å and V = 2 × 2434 Å3, which is C centered. The new structure refinement of rameauite converged to R = 4.23% for 2344 unique observed reflections with I > 3σ(I) and GOF = 1.48. The current investigation documented how peculiar twinning can be, not only for this group of minerals, and how care must be taken in handling the data biased by twinning.
ER  -

PLÁŠIL, Jakub; Václav PETŘÍČEK; Radek ŠKODA; Nicolas MEISSER a Anatoly V. KASATKIN. Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry. \textit{Journal of Applied Crystallography}. International Union of Crystallography, 2021, roč.~54, č.~6, s.~1656-1663. ISSN~1600-5767. Dostupné z: https://doi.org/10.1107/S1600576721009663.

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