I love that stuff too. It can sure give you fits trying to run a flake through the different bands of texture, though, can't it? Especially that chalky gray part.
NCHillbilly, you sure know your rock , that gray stuff may as well be concrete or steel. trying to do it with percussion was hard enough but pushing a flake through it was like trying to tear off a layer of steel off of a block. Some very tough stuff but the outcome is well worth the work.
Chocolate swirl Coastal Plains chert. You can work it raw, especially the better grade, but when it is cooked right, it brings out some unbelievable colors. Years ago I found where a construction site had uncovered a Mother Lode of it. I got about a ton of it out before they poured a concrete foundation on top of it.
I was given this rock 3 years ago and had no idea what it is or anything about it. I just decided to try and make a point. thanks for all the info Nic and Chehawknapper. I really appreciate all the knowledge that you two share with us. I wish I had more of this rock but I got a 5 gallon bucket of odds and ends to practice on for 20 bucks. This was some of the bucket. I try to match up the different rock with what info I can find on this form and on other forums. Sometimes I am right sometimes I am wrong but I do know that I am starting to get better at making points.