Deformation band

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Geological----Distinct bands at the microscale of different extinction that are obviously part of the same crystal. A more localised form of undulose extinction where some concentration of dislocation has taken place. In picture below they trend NE-SW (M. Jessell and P . Bons, CET/UWA Microstructure Course 2014; http://www.tectonique.net/mscourse2014/index.html).