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Heat treating in roaster.

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Allyn T:
Man that is beautiful stone! Im really glad you posted, we need more info on poor man's heat treating for sure. Do you insulate the lid of your roster? I need to test mine and see what temps I'm getting. Mine goes to 450, I used no sand and I cooked for 24 hours this time. I used a drying temp of 175 for 11 hours first then I turned it straight to 450. When it was done I turned it all the way down and unplugged it. Opened it about 10 hrs later. No pops or broken rock inside.

RickB:
Thanks, glad to help and others may have additional info to chip in. I do not insulate the lid but I know that many others do.
This mookaite is pretty expensive material from Australia and I've picked up a piece or two at various gem and mineral
shows in North Carolina through the years. Finally was able to get someone to slab some and then I did the trim work. It has
so many fissures that it has to be trimmed along the cracks to get fairly clean pieces that are knappable. I have heat treated
chert spals basically the same way as I did these slabs. Soak time in the heat is longer when heating thicker pieces. Check out
temps and heating times for different rocks on the internet.

Here's a ten year old post from archaeologist/flint knapper Michael Miller that has great information.

bjrogg:
Thanks for sharing Rick

That’s some pretty stuff.

Bjrogg

gutpile:
When cooking rock under a fire best be sure you have no rain in forecast or you will lose that stone.. I've never cooked any rock yet .. when I buy it it is already treated..no rock around me but quartz and you got to find the right quartz too.. most milky or real translucent is only knappable stuff around me.. so I have to buy or barter my rock..  I watched full circle by thad beckum.. he cooks rock under a fire with great success.. lines the rock in a sand bed and covers it.. really cool stuff to watch it change colors and upgrade the lithics of the stone.. early man were badasses.... gut

Allyn T:
Yes early man really set the stage for the rest of us. D.C. Waldorf in his book uses a kiln and the temps he gave for material around me were 550-600 for harvest, and 600-675 for Burlington. With him doing it in a kiln it really isn't applicable to what I do but I'm trying to base my longer cook times off of his temperatures. I really need to get a thermometer in my roaster to see what it is getting too. I hope people keep posting their turkey roaster rock recipes and their results I think it would be beneficial to all of us. I'm going to try to heat treat some harvester just to see what it does. I'm just glad I don't have to heat agatized coral or novaculite, those require some ridiculously high temps.

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