The extinction angles on the deformed sanidine single crystals

Abstract

Experimentally deformed sanidine single crystals have been investigated by an optical microscope in order to establish relations between their deformations and change of extinction angle. It is found that the change of extinction angle in a deformed single crystal is large in the strongly deformed part. The variation of the extinction angle is very sensitive to the deformation even for weakly deformed crystals. This characterization technique is useful to observe semi-quantitatively the deformation of mineral single crystals and can complement the deformation study by TEM and optical microscope with a universal stage.