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Texture of Knappable stone

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JoJoDapyro:
SO after spending a few hours today looking for some knappable stone we (Tyke and I) found a few rocks that look right, and fracture somewhat right. Will Heat treating stone make it fracture more consistently, or are we wasting time hoping that a material that doesn't have a good smooth texture ever be right? Here is a photo of one of the stones we found. Keep in mind this is wet as it was raining on us all morning. Very hit or miss, and unfortunately none of these appear to be native stones to the area we collected them. This one seems to break wrong, but the feel and look of the red band look right. Also, Should stone be spalled before you heat treat them under a fire? Thanks.

Joe

mullet:
Try heating it. You will never know till you do. Coral is some pretty nasty stuff till you cook it.

JoJoDapyro:
Also, I forgot to mention that it does throw sparks, and it does ring, not as well as Obsidian, but ring non the less.

While heating under a fire how would I proceed? I have sandy soil where I live (The town is called Sandy) So do I dig a hole a cover it with about 6 inches?

JoJoDapyro:
The rain has stopped for now. Here are some photos of the stone collected. The first and last photo appear to be the same type of stone. Not smooth, but still seems to break right. The second photo is of one stone that broke in half while trying to spall it. It also isn't smooth.

JoJoDapyro:
These last two are of the first stone I took pictures of. What caught my eye was the band in it, in the last photo.

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