Abstract
DEFORMATION lamellae in quartz have attracted the attention of geologists for many years. They are now used in structural geology to determine palaeo-stress orientations1 and the lattice planes along which slip has occurred in quartz2, especially during experimental deformations. The viability of these techniques depends upon the hypothesis that all lamellae are slip planes3 (CGC model) and are seen optically because of their associated long range stress fields. I have been studying ion thinned foils of naturally deformed quartz containing deformation lamellae in an AEI EM7 electron microscope operating at 1,000 kV and I have found that several defect structures are seen optically as deformation lamellae. It seems that the structures of most naturally produced lamellae differ from the CGC model.
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