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Texas stone

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JackCrafty:
Paul, that stone looks like it won't flake well no matter how much heat you use. But it won't hurt the stone to heat it again. If it feels "powdery" or grainy on the surface after heat treating, it's a good indication that it's going to give you trouble.

Unfortunately, a lot of TX rock is poor quality. If you want the really good stuff, order from Bob at apocalithics on ebay, or from Kinley Coyan. There are others but those are the two guys I personally order from.

Hawkdancer:
From a flint knapping dummy:  how do you tell if the Rock has already been heat treated, or needs to be heat treated?  Hope I am not hijacking the thread!
Hawkdancer

paulc:
definitely feels grainy after the first cook session...it's just rock right so either way its no big deal  :-\

HD, I don't know enough to comment intelligently but I will anyway :-)  If the rock feels smooth or waxy then no need to cook it.  Otherwise cooking might help it...

fwiw.  PC

JackCrafty:
Jerry, there's no guaranteed way to tell if a rock has been heat treated. But after making hundreds of arrowheads, you kind of get the feel for it.

The only way to know for sure if a stone needs heat is to try knapping it. Again, after making many arrowheads from a certain material, it will feel difficult to knap compared to the heated version of that material.

paulc:
I rolled the dice and this is what I'm left with. Not a bird point but also not an arrowhead yet. This weekend will be make or break it :-)

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