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Growth ordering and anomalous birefringence in ugrandite garnets

Published online by Cambridge University Press:  05 July 2018

A. G. Shtukenberg*
Affiliation:
Crystallography Department, Geological Faculty, St. Petersburg State University, Universitetskaya emb., 7/9, 199034 St. Petersburg, Russia
D. Yu. Popov
Affiliation:
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Science, 159 Pr-t-100-letiya, Vladivostok 690022, Russia
Yu. O. Punin
Affiliation:
Crystallography Department, Geological Faculty, St. Petersburg State University, Universitetskaya emb., 7/9, 199034 St. Petersburg, Russia

Abstract

Intermediate members of the grossular–andradite and grossular–uvarovite series are known to display anomalous birefringence, which is inconsistent with the ideal cubic space group of garnet Iad. To determine the reason for such birefringence, the crystal structures of at least 15 samples were refined by different authors including the present ones. The crystals with the value of anomalous birefringence of Δn > 0.001 are normally characterized by partial ordering of the octahedral cations (Al/Fe and Al/Cr for grossular–andradite and grossular–uvarovite series, respectively). This reduces the symmetry to the orthorhombic space group Fddd or even to the triclinic space group I. As is seen from the distribution of occupancies over octahedral sites in the triclinic space group, eight occupancies are grouped into two quartets of similar occupancies, leading to pseudo-orthorhombic crystal structures. The variety of structures with different degrees of pseudo-orthorhombicity is due to the action of the growth dissymmetrization mechanism. Simulations of the optical indicatrix in the point-dipole approximation confirm cation ordering as the main cause of the anomalous birefringence.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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