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An application of the point-dipole model to the problem of optical anomalies in grandite garnets

Published online by Cambridge University Press:  05 July 2018

A. G. Shtukenberg ,
D. Yu. Popov  and
Yu. O. Punin
A. G. Shtukenberg*
Affiliation:
Crystallography Department, St. Petersburg State University, Russia
D. Yu. Popov
Affiliation:
Institute of Chemistry FEBRAS, Vladivostok, Russia
Yu. O. Punin
Affiliation:
Crystallography Department, St. Petersburg State University, Russia
*
*E-mail: [email protected]
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Abstract

The origin of anomalous birefringence in grossular-andradite (grandite) garnets is considered. Using the point-dipole model we have calculated the anomalous optical indicatrix for four crystals (three from the paper by Takéuchi et al. (1982) and one studied previously by the present authors). The calculated indicatrix is in good agreement with the observed one. This suggests that the origin of anomalous birefringence in grandite garnets is due to Al/Fe ordering. Interrelations between the observed optical indicatrix, the structure of the growing face, the site occupancy in the crystal structure and the calculated optical indicatrix suggest a growth origin of Fe/Al ordering in grandite garnets and confirm the growth dissymmetrization hypothesis.

Keywords

point-dipole modeloptical anomalygrandite garnets
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 2 , April 2002 , pp. 275 - 286
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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