While weaker rocks like shale or rock salt will fracture or flow when subjected to stresses, harder rocks like granite, quartzite and peridotite rarely deform.

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Harder rocks like granite, quartzite, and peridotite can also deform under stress, but they typically do so at higher pressures and temperatures compared to softer rocks like shale or rock salt.

While Weaker Rocks Like Shale or Rock Salt Will Fracture