In the southeastern US we often find ‘fire cracked’ rocks at pre ceramic sites the we think are used for similar purposes. The cracked ones are often crystalline river cobbles that can’t take the thermal shock.
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And especially when you pop them back into the fire 🔥- we haven’t experimented but I suspect a single stone (depending on lithology) might only last a few uses. Also, you can heat water in a leather bag.
There are California illustrations that showed Native Americans boiling in bags. Most of the cobbles around here are quartz/ite. They add small grit to whatever was being boiled. Steatite/soapstone disks and ,which don’t shatter were traded through the SE US in the Late Archaic Period
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