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Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

Published online by Cambridge University Press:  28 November 2019

Pavle Tančić*
Affiliation:
Geological Survey of Serbia, Rovinjska 12, 11000Belgrade, Serbia
Aleksandar Kremenović
Affiliation:
Laboratory of Crystallography, Faculty of Mining and Geology, University of Belgrade, Ðušina 7, 11000Belgrade, Serbia
Predrag Vulić
Affiliation:
Laboratory of Crystallography, Faculty of Mining and Geology, University of Belgrade, Ðušina 7, 11000Belgrade, Serbia
*
a)Author to whom correspondence should be addressed. Electronic mail: pavletan@gmail.com

Abstract

In this paper, grandite core with Grs64±1Adr36±1Sps2 composition was crystallographically studied. This core represents zone A of the macroscopically visible five A–E zones of the optically anisotropic Grs58–64Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all of the presented results allows us to undoubtedly conclude that studied grandite is not cubic, neither as monophase nor as multiple phases in a mixture. Namely, it was established that structural dissymmetrization occurred and that it crystallized in the disordered rhombohedral $R\bar{3}c$ or orthorhombic Fddd space groups, whereby the first one is more probable. Beside the established lower symmetry of the studied grandite, which could be treated as the primary cause, the residual strain is also not excluded as the second possible cause for its slight optical anisotropy.

Type
Technical Article
Copyright
Copyright © International Centre for Diffraction Data 2019

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