Abstract
The article presents the results on the chemical and morphological research of corundum crystals (α-Al2O3) from several African, Asian, and Russian deposits. The trace- elements of interest were determined by rim-to-rim laser ablation-inductively coupled plasma- mass spectrometry and electron micro-probe analyses coupled to Cr3+ photoluminescence mapping. The variations of corundum morphology are directly linked to a distinct range of Cr and Fe values. Chromium ions, which are larger than Al ions, when substituting in the crystal structure, elongate it along the prismatic face or the c axis. Whereas the fastest growth of the bipyramidal faces is linked to the co-introduction of Cr and Fe ions. The higher amount of Fe comparing to Cr (3: 1 and more) leads to faster growth of the rhombohedron and pinacoid faces.
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Acknowledgments
Prof. Dr. L.N. Kogarko and colleagues from GEOKHI RAS, as well as prof. R.E. Botcharnikov, prof. W. Hofmeister, Dr. T. Häger and colleagues from JGU for their assistance in analytical studies and discussion of the results. The work was supported by a postdoctoral fellowship of Alexander von Humboldt Foundation and GEOKHI RAS.
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Sorokina, E.S. (2023). Trace Element Impact on the Corundum Morphology. In: Marin, Y. (eds) XIII General Meeting of the Russian Mineralogical Society and the Fedorov Session. GMRMS 2021. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-23390-6_13
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DOI: https://doi.org/10.1007/978-3-031-23390-6_13
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