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Is this knapable?

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bjrogg:
         There was a guy selling stones at our fair. He had a few pretty crude arrowheads that someone else knapped. He didn't know anything about knapping.
         I'm wondering what this material is and if it's knapable. It's kinda a shame to knap it because it's all polished and very pretty. I'm sure I can make something from it. I did take a few flakes off one of the smaller ones. It seems knapable but pretty coarse. I'm wondering if heat would help it. I only paid $10 for the whole works. Think If they are knapable I might get them for less before he polishes them. If I remember right he said it was agate, I think from Arizona. Can't remember where for sure but he said it was agate which I believe is knapable. In fact the nicest piece of ever worked I was told was agate, but this must be raw.
        He told me he didn't think you could knap it, if you hit it it would break. I told him so would glass, but if you hit it right it's knapable.
        Here's some pictures if my photo bucket still works
Bjrogg
   

bjrogg:
If you look closely at the smaller ones. The bottom of the second one has a few short test flakes. There is a cortex around the outside of all of them.
Bjrogg

Blitzkrieg721:
im pretty sure most all agates are knappable, some more so than others of course. and some DO require heat before they will work. some require a good bit of heat also.

Hawkdancer:
The Native Americans used agate quite a bit, but I don't know how they processed it to work it.  I bought several pounds in Arizona this summer. And will probably work it as I get stronger in the hand.
Nice looking pieces you have there, they should finish real pretty.
Hawkdancer

bjrogg:
Thanks blitzkrieg721 and Hawkdancer. I'm thinking this stuff is knapable but I'm thinking it might help to cook it. I might even be able to look back through my old PM's and find a recipe for agate. Kinda wish I'd of gotten this guy's name and number. He said he'd be back next year.
Bjrogg

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