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Anybody knap one of these?
bjrogg:
If you look at the Break wall in the harbor of Harbor Beach you can find them in the limestone. some are basketball size.
bjrogg:
I just looked up hornstones on the web. these are different than them. These are almost perfectly round like a ball. They have a concrete lime stone shell around them and mixed in with the chert in places inside ball too. The concrete shell is really hard to remove I use very large hammerstone
le0n:
--- Quote from: bjrogg on May 10, 2016, 09:33:46 pm ---Do you think I could use a sand filled fire pit to cook them whole or should I try to split them 1st?
--- End quote ---
definitely bi-polar split & spall first.
otherwise you can have the entire ball self-destruct.
Chippintuff:
http://www.pugetsoundknappers.com/how_to/New%20Heat%20Treating%20Guide%20with%20Table.html
That stone looks wicked. A little heat could make it nice stuff. However, heating rocks is tricky. It will have to be knocked down to flakes and fairly thin spalls before cooking. Thickness and cortex are enemies of the process. I have opened the kiln to find it full of sand instead of knappable stone. Successful heat treating can be tricky. Follow the instructions in the link above, and I think you may have success.
WA
bjrogg:
Thanks guys I'm gonna get some more of these from my cousin try the bipolar method and try to cook some in a pit. I took a walk on one of our windmill road found a bunch of pretty promising stuff but it's all been run through crusher most will have inclucsions in it. Who know maybe I'll try to cook some at Marshall.
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