List
Alibates: 450 - 500 / 18 to 20 hrs.
Arizona Chert: 575 - 675 / 12 to 20 hrs.
Arizona Jasper: 475 - 550 / 18 to 24 hrs.
Brazilian Agate: 450 - 600 / 10 to 14 hrs.
Burlinton: 500 - 675 / 18 to 26 hrs.
Divine Agate: 525 - 600 / 14 to 20 hrs.
Dacite: NONE
Florida Coral: 450 - 550 / 18 to 36 hrs.
Florida Chert: 550 - 600 / 14 to 18 hrs.
Georgetown: 400 - 500 / 18 to 20 hrs.
Georgia Caramel: 425 - 450 / 12 to 18 hrs.
India Agate: 500 - 550 / 16 to 18 hrs.
Jasper (Agitized Cobbles): 450 - 525 / 10 to 14 hrs.
Mexican Agate: 500 - 575 / 10 to 18 hrs.
Missouri Chert: 450 - 500 / 14 to 18 hrs.
Missouri Coral: 475 - 525 / 10 to 14 hrs.
Novaculite: 750 - 900 / 20 to 24 hrs.
Obsidian: NONE
Opals: NONE
Palmwood Agitized: 450 - 550 / 20 to 24 hrs.
Pedernales Amoeba: 575 - 625 / 18 to 20 hrs.
Pedernales Petrified Wood: 475 - 500 / 18 to 20 hrs.
Pedernales Tabular: 375 - 475 / 14 to 16 hrs.
Petrified Wood Agitized: 350 - 600 / 10 to 24 hrs.
Redland Road: 425 - 475 / 12 to 14 hrs.
Rootbeer: 450 - 575 / 18 to 20 hrs.
I preheat all rocks for 24 hrs. at 250 degrees to make sure they're dried
before cooking. At the end of the drying cycle, I will ramp up my temperature at 50 degrees @ hr. till I have reached my desired temp. I
also use sand as a filler for even heat distribution.

Remember no two rocks are the same, what works on one may not work on the other.
I'll just say, concerning water treating, if you have a piece of stone that
you can't seem to do anything with or maybe you don't have any way
to cook it, throw it in a bucket of water and forget about it. I had a bunch of fresh Georgetown, that had just been excavated, that I took home and spalled out. I forgot about the rest for about 4 months and when I got back to spalling it again, (it had been laying in the yard most of the summer) I had a lot of problems with it wanting to hinge
and step (it had dried out in the sun). I just threw it in a bucket of water for a few months, making sure it stayed wet. The rock acted just
the way it did when I first brought it home. It didn't really drop it that
far on the lithic scale, but there was a noticable improvement.
  By the way, if you live in the Back Woods (and we really don't have to
pump in sunshine, although a few do drink it), or near a Bayou (swamp
water to our Northern Friends), you
really might consider adding a
little motor oil to the water to keep the mosquito larvae out. We don't need to provide any more breeding grounds for the pesky little critters.
"Ma" Nature's doing fine on Her own!