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Optical properties and crystal structure of triclinic growth sectors in vesuvianite

Published online by Cambridge University Press:  05 July 2018

T. Tanaka ,
M. Akizuki  and
Y. Kudoh
T. Tanaka*
Affiliation:
Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
M. Akizuki
Affiliation:
Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
Y. Kudoh
Affiliation:
Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
*
*E-mail: t-tanaka@mail.cc.tohoku.ac.jp
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Abstract

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 structuregrowth sectorsvesuvianitecrystal growth
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 2 , April 2002 , pp. 261 - 274
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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