From nanoscale heterogeneities to nanolites: cation clustering in glasses

Autor: Laurent Cormier, Laurence Galoisy, Gérald Lelong, Georges Calas

Publikováno v: Comptes Rendus. Physique. 24:1-15

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b9cee31c13ac6967bcccd260134a12b
https://doi.org/10.5802/crphys.150

Mn3+ and the pink color of gem-quality euclase from northeast Brazil

Autor: Lætitia Gilles-Guéry, Laurence Galoisy, Jurgen Schnellrath, Benoit Baptiste, Georges Calas

Publikováno v: American Mineralogist. 107:489-494

Pink euclase of gem quality and centimeter size, presenting an unusual pink-orange coloration and a pink to orange pleochroism, was discovered near Livramento de Nossa Senhora, in Bahia State, Brazil. The origin of the pink coloration has been invest

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6d0ac4b497578010e1c134499a569bd
https://doi.org/10.2138/am-2021-7838

Sodium nanoparticles in alkali halide minerals: Why is villiaumite red and halite blue?

Autor: Laurence Galoisy, Alexis Geisler, Georges Calas

Publikováno v: American Mineralogist
American Mineralogist, Mineralogical Society of America, 2021, 106 (5), pp.838-842. ⟨10.2138/am-2021-7917⟩
The American Mineralogist
The American Mineralogist, 2021, 106 (5), pp.838-842. ⟨10.2138/am-2021-7917⟩

The presence of metal Na nanoparticles causes the bright, thermally unstable colors of villiaumite (NaF) and halite (NaCl). These nanoparticles have been suspected for a long time to be caused by external irradiation. Metal nanoparticles, often refer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2a270d5608ff3a4e46198ad72d1baff
https://doi.org/10.2138/am-2021-7917

Niobium speciation in minerals revealed by L2,3-edges XANES spectroscopy

Autor: Quentin Bollaert, Mathieu Chassé, Hebatalla Elnaggar, Amélie Juhin, Alexandra Courtin, Laurence Galoisy, Cécile Quantin, Marius Retegan, Delphine Vantelon, Georges Calas

Publikováno v: The American Mineralogist
The American Mineralogist, 2022, 108 (3), pp.595-605. ⟨10.2138/am-2022-8293⟩

The systematic mineralogy of niobium (Nb) is complex, with more than one hundred species dominated by multicomponent oxides of similar chemistry. The determination of Nb speciation in solids (i.e., the distribution between the phases and the crystal-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ce0e311a1ea4d8ff1cf7f1ba66d638c
https://hal.science/hal-03695880/file/bollaert_2021_ms_merged.pdf

Insights on the Cenozoic climatic history of Southeast Australia from kaolinite dating

Autor: Maximilien Mathian, Mathieu Chassé, Georges Calas, William L. Griffin, Suzanne Y. O'Reilly, Thibault Buisson, Thierry Allard

Publikováno v: Palaeogeography, Palaeoclimatology, Palaeoecology
Palaeogeography, Palaeoclimatology, Palaeoecology, 2022, 604, pp.111212. ⟨10.1016/j.palaeo.2022.111212⟩

International audience; Australia hosts some of Earth’s oldest regolith. They were preserved through geological time thanks to exceptionally low erosion rates affecting large parts of this continent. Accurate chronological constraints about their f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a4525b7e5bd79446d04846f787cddf0
https://doi.org/10.1016/j.palaeo.2022.111212