Decoration of grain boundaries in polycrystalline rocks has a long tradition in Structural Geology as in a monomineralic rock the recrystallized grain size is a good indicator for the paleostress conditions. Understanding the mechanical properties of rock salt and its deformation behavior is of major importance for the prediction of long-term stability of nuclear waste repositories, and for our understanding of the dynamics of salt-related sedimentary ba sins which host the majority of oil and gas deposits on Earth. Common methods to expose grain boundaries and substructures in rock salt are chemical etching procedures using brine or water or the gamma irradiation method.
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