Articles | Volume 38, issue 1
https://doi.org/10.5194/ejm-38-53-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-53-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Deciphering crystal growth in a sector-zoned interpenetration twin of loparite from Mt Khibiny (Kola Peninsula, Russia) through atomic-scale characterisation of growth sectors and twin boundaries
Nina Daneu
CORRESPONDING AUTHOR
Advanced Materials Department, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
José Alberto Padrón-Navarta
CORRESPONDING AUTHOR
Instituto Andaluz de Ciencias de la Tierra (IACT-CSIC), 18100 Armilla, Granada, Spain
Martin Šala
Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
Kristina Mervič
Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
Gerlinde Habler
Department of Lithospheric Research, University of Vienna, Josef-Holaubek-Platz 2, 1090 Wien, Austria
Goran Dražič
Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
Petruša Borštnar
Advanced Materials Department, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Aleksander Rečnik
Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Rainer Abart
Department of Lithospheric Research, University of Vienna, Josef-Holaubek-Platz 2, 1090 Wien, Austria
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Atmos. Chem. Phys., 21, 11801–11814, https://doi.org/10.5194/acp-21-11801-2021, https://doi.org/10.5194/acp-21-11801-2021, 2021
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Alkali feldspar is the most abundant mineral in the Earth's crust and is often present in mineral dust aerosols that are responsible for the formation of rain and snow in clouds. However, the cloud droplets containing pure potassium-rich feldspar would not freeze unless cooled down to a very low temperature. Here we show that partly replacing potassium with sodium would induce fracturing of feldspar, exposing a crystalline surface that could initiate freezing at higher temperature.
Pascal Bohleber, Marco Roman, Martin Šala, Barbara Delmonte, Barbara Stenni, and Carlo Barbante
The Cryosphere, 15, 3523–3538, https://doi.org/10.5194/tc-15-3523-2021, https://doi.org/10.5194/tc-15-3523-2021, 2021
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Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) offers micro-destructive, micrometer-scale impurity analysis of ice cores. For improved understanding of the LA-ICP-MS signals, novel 2D impurity imaging is applied to selected glacial and interglacial samples of Antarctic deep ice cores. This allows evaluating the 2D impurity distribution in relation to ice crystal features and assessing implications for investigating highly thinned climate proxy signals in deep polar ice.
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Short summary
Loparite is a chemically complex perovskite oxide; the crystals often show zoning and develop as spinel-type interpenetration twins. Atomic-scale analyses of a sector-zoned twin from Mt Khibiny have revealed that cubic and octahedral sectors exhibit distinct elemental ordering, driven by differences in composition and slow cooling. The configuration of twin boundary contacts indicates twinning by nucleation, followed by independent growth of the domains in twin orientation from the melt.
Loparite is a chemically complex perovskite oxide; the crystals often show zoning and develop as...