Tectonic activity bends rocks all the time, even hard ones like granite. That takes a ton of heat, pressure and time. It also makes sense that in the right conditions, sheets of rock simply don’t have the room to shatter so they must bend.

Have we been able to do the same in a lab and would it have any commercial use? Bending a random bit of hard rock would be an interesting novelty, for sure.

    • @[email protected]OPEnglish
      1•8 months ago

      The glass transition temperature of quartz is 1200°C, and according to the charts I could find, is outside crust and upper mantle temperature ranges. (That is just based on averages, I believe. Heat from friction may be in a different category.)

      Edit: The melting temperature is ~1700°C. It probably starts to get malleable around 1200°C. I was confused about the term “glass transition” due to some of my hobbies and likely does not apply.

      Other silicon-type rocks (like gypsum; opposed to quartz) have wildly different glass transition temperatures in the 200°C range. That seems feasible to bend in a lab and could be in-scope.

      Still, quartz can fold: https://www.researchgate.net/figure/a-to-c-Folded-quartz-veins-with-highly-irregular-geometries-from-the-Variscan-Belt-of_fig2_328655254

      I think that creep is not the same as folding but the two conditions could easily be related?

      (I am just regurgitating data points I have only just found and there is probably much more to this.)

      • @[email protected]English
        2•8 months ago

        Hmm. I’m going to have to look up how you model glass bending, if that’s how it works. I wonder if you could do this in a garage setting, even. I’m not surprised a calcium mineral is less resistant to it, they seen less hardcore in general or something.

        • @[email protected]OPEnglish
          1•8 months ago

          Glass is a weird one since it’s an amorphous solid.

          Excuse, me though. I might be mixing up my definition of “glass transition”. It’s a term used for plastics (and other amorphous solids) when they start to becomes malleable.

          In the above case, I think I tried to apply it to quartz which is incorrect. The temperature ranges are still in the ball park of my intent.