Relations between morphology of corundum and trace element composition

Sorokina E. S.

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2021. V. 150. N 3. P. 145-153

https://doi.org/10.31857/S0869605521030102

Full text is available on eLIBRARY.RU

Language: Russian 

Abstract

The paper displays results of the study, which show that changes of corundum morphology are directly linked with various ranges of minor Cr and Fe contents. Cr³⁺ ions, being larger than Al³⁺ ions, entering in the crystal structure make it elongated along the axis с. The mutual entering of Cr³⁺ and Al³⁺ ions leads to the accelerated growth of the dipyramidal faces. The larger content of minor Fe, as related the Cr one (3 : 1 and more) put forward to the quicker growth of rhombohedron and the c pinacoid faces.

Keywords: corundum, morphology, crystal simple forms, minor elements