Optical properties and crystal structure of triclinic growth sectors in vesuvianite

T. Tanaka, M. Akizuki, Y. Kudoh
2002 Mineralogical magazine  
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.
more » ... t by phase transitions.
doi:10.1180/0026461026620027 fatcat:q4badk7mungjpoqga2rz2dm7z4