Grain boundary maps for the manuscript "A cavitation-seal mechanism for ultramylonite formation in quartzfeldspathic rocks within the semi-brittle field (Vivero fault, NW Spain)"

Zip file containing: (1) tif files of selected SEM-BSE images showing ultramylonite microstructure (2) png files with the grain boundary maps manually outlined using Adobe Illustrator from original SEM-BSE images (3) text (.txt) files (tabular-like) containing the shape features and centroid locations measured with the ImageJ v1.51 application