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Just one simple question about flint knapping.

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nclonghunter:
I am going to step out on a limb on this one...may help to know what area (state) you are finding the rock. The top photo looks like a hard rhyolite (maybe). The middle one is hard to say since I can only see the outer cortex or skin. It does not look like a knappable rock. The third looks like a quartz of some type and may be workable to some degree.

All three do not appear to have great "conical fractures" from what I can see. There are flints or charts that break clean and smooth and some are harder to work. What I am trying to say is those rocks may be workable but they appear they would be a real challenge compared to better quality rock.

Just what I am seeing....hopefully someone with more knowledge will help out.

lenador:
That's kind of what I was leaning towards. I'm curious as to how or where to start as far as trying to break a way or crack the rocks to see the inside.

TRACY:
Looks like some kind of milky quartz or man rock, not knappable. If you mention location the  guys can give you a heads up or prospect of rock in your area to save time and your arm :)

Sounds like your looking in good areas.


Tracy

lenador:
Sorry my bad. I live close to starved rock in IL. My specific location is mendota IL. Lots if rivers in our area, lots of chunks of land opened by glaciers, we even have a piece of Canada that was pushed here by a glacier. Its not very uncommon to find arrow heads around here.

nclonghunter:
I live in NC and man rock Rhyolite is the common rock here and it is hard. I use a hammer sometimes to knock corner edges to get large flakes and reduce the core. A large granite rock has also been used and works. Some folks like to use dogwood billets to reduce hard rock.
Pete Davis in Virginia and some others break and make points out of rock with iron in it. He would be a great source to ask on reducing hard rock.
Another method is to dig a partial hole and put a round hard rock in the center. Lay the rock you want to break in half on top and then hit it with another dead center on top and it will sometimes break in to two pieces of equal size.
Good Luck

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