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Mineralogical Magazine; April 2002; v. 66; no. 2; p. 261-274; DOI: 10.1180/0026461026620027
© 2002 Mineralogical Society of Great Britain and Ireland
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Optical properties and crystal structure of triclinic growth sectors in vesuvianite

T. Tanaka*, M. Akizuki and Y. Kudoh

Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan

* E-mail: t-tanaka{at}mail.cc.tohoku.ac.jp

Sectored vesuvianite showing optically triclinic properties was studied by X-ray and P-FTIR analyses, and the origins of the internal optical texture are discussed. A monoclinic refinement (space group P2/n) suggests that site occupancies are slightly different among the Al(2) series, though the OH– dipole is randomly oriented in all sectors. A relationship between the surface and internal texture suggests that these sectoral structures were produced during crystal growth, not by phase transitions.

KEYWORDS: crystal structure, growth sectors, vesuvianite, crystal growth




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