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Mineralogical Magazine; April 2002; v. 66; no. 2; p. 275-286; DOI: 10.1180/0026461026620028
© 2002 Mineralogical Society of Great Britain and Ireland
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An application of the point-dipole model to the problem of optical anomalies in grandite garnets

A. G. Shtukenberg1,*, D. Yu. Popov2 and Yu. O. Punin1

1 Crystallography Department, St. Petersburg State University, Russia
2 Institute of Chemistry FEBRAS, Vladivostok, Russia

* E-mail: sasha{at}as3607.spb.edu

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 model, optical anomaly, grandite garnets




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