http://hdl.handle.net/20.500.12128/20694
Tytuł: | Kahlenbergite KAl11O17, a new β-alumina mineral and Fe-rich hibonite from the Hatrurim Basin, the Negev desert, Israel |
Autor: | Krüger, Biljana Galuskin, Evgeny Galuskina, Irina Krüger, Hannes Vapnik, Yevgeny |
Słowa kluczowe: | Kahlenbergite; Hibonite; Hatrurim Basin; the Negev desert; Israel; β-alumina mineral |
Data wydania: | 2021 |
Źródło: | European Journal of Mineralogy, Vol. 33, iss. 4 (2021) s. 341-355 |
Abstrakt: | Kahlenbergite, ideally KAl11O17, and Fe-rich hibonite, CaAl10Fe2O19, are high-temperature minerals found in “olive” subunits of pyrometamorphic rocks, in the Hatrurim Basin, the Negev desert, Israel. The crystal structures of both minerals are refined using synchrotron radiation single-crystal diffraction data. The structure of kahlenbergite (P63/mmc; a = 5.6486(1) A; b = 22.8970(3) A; Z = 2) exhibits triple spinel blocks and so-called R blocks. The spinel blocks show mixed layers with AlO6 octahedra and (Al0.56Fe0.44)O4 tetrahedra and kagome layers with (Al0.92Fe0.08)O6 octahedra. One-dimensional diffuse scattering observed parallel to c* implies stacking faults in the structure. Also, in one of the investigated kahlenbergite crystals additional reflections can be identified, which obviously belong to a second phase with a smaller lattice parameter c: Fe3+-rich hibonite. The structure of hibonite contains the same spinel blocks as kahlenbergite. The R blocks in hibonite contain Ca atoms, AlO5 bipyramids, and AlO6 octahedra, whereas the R blocks in kahlenbergite contain potassium atoms and AlO4 tetrahedra. |
URI: | http://hdl.handle.net/20.500.12128/20694 |
DOI: | 10.5194/ejm-33-341-2021 |
ISSN: | 1617-4011 0935-1221 |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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Kruger_Kahlenbergite_KAl11O17.pdf | 9,78 MB | Adobe PDF | Przejrzyj / Otwórz |
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