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Max, have a look at: Stephan Becker, Christoph Hilgers, Peter A. Kukla, Janos UraiCrack-seal microstructure evolution in bi-mineralic quartz–chlorite veins in shales and siltstones from the RWTH-1 well, Aachen, Germany. Journal of Structural Geology 33 (4): 676-689 (2011) you can download it here: http://www.ged.rwth-aachen.de/files/publications/publication_1177.pdf and Steffen Abe, Janos Urai, Michael Kettermann Fracture Patterns in Non-Plane Strain Boudinage - Insights from 3D Discrete Element Models. Journal of Geophysical Research. (In press) http://www.ged.rwth-aachen.de/files/publications/publication_1728.pdf kind regards, Janos On 21 Feb 2013, at 09:29, Max Peters <[log in to unmask]> wrote: Dear list members, I am working on the microstructural characterization of necking instabilities and deformation mechanisms in pinch-and-swell structures. I came across bi- (quartz, calcite) or polymineralic (quartz, calcite, mica, graphite etc.) veins that were deformed. My question to you is, whether you know any study focussing on polymineralic vein deformation, or could explain own examples to me. Thank you in advance! Kind regards, Max Peters ________________________________ Max Peters PhD student Institute of Geological Siences, University of Bern Switzerland