As a rule of thumb, diffusion along grain boundaries is several orders of magnitude faster than within minerals and hence it could enable mass transport on much larger spatial scales within geological time scales. Therefore Earth scientists are interested in the transport properties of grain and interphase boundaries (and other short circuit diffusion paths such as dislocations or a fluid network) since they may provide very efficient transport paths controlling a variety of processes operating on very different spatial scales. For example, on a micron scale, corona formation around minerals is a common phenomenon that is typically controlled by grain...

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