# Defects in deformation twins in plagioclase

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## Abstract

The topological model is applied to analyze defects associated with albite and pericline twins in plagioclase. Twin growth occurs by the motion of twinning disconnections. The same twinning disconnections are shown to produce both twins. The topological model is used to predict the atomic details of the disconnections. High-resolution transmission electron microscopy results verify the model predictions. Early work on the possibility of pseudo-twinning is also discussed.

## Keywords

Twinning Mineral Structural group Dislocations Disconnections Topological model## Notes

### Acknowledgements

The authors are pleased to acknowledge helpful contributions by R.C. Pond. Xie and Wang acknowledge support from the US National Science Foundation (NSF) (CMMI-1661686). Greg Hirth acknowledges support from NSF: EAR-1624178.

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