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this post was submitted on 11 Mar 2024
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~~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.)
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.
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.