Cooked Jasper Vs Raw Jasper?

[CMD]

Here is an older thread, archived, looks like it never made it over to the newer platform for our forum.

http://forum.arrowheads.com/index.ph...ast-r-i-and-pa

And from that thread, the first photo is a large chunk of the jasper typical of Limerock. The second photo is a cobble from Narragansett Bay. Probably glacial, and likely originating from Limerock. The wife and I loved mineral collecting at Limerock when the open pit still existed....

[-=METACOM=-]

Nice examples, I really like the black jasper.

[kayakaddict]

Not just jasper but all quartz and quartzite were heat treated, and is several stages often, especially before the final pressure flaking to finish a point. Red is not common here in south Jersey but occasionally turns up as heat treated pebbles, imported Pa Jasper and various quartzites. Always exciting to see red. Fire pops in the surface give it awayif it was strongly heated.

[Shedhunter]

Mark, sorry for the delay but here are the pictures of the pieces I mentioned earlier in this post, first pic is a piece I collected from Limerock quarry. The second is a piece I picked up on a beach in Mount hope bay.

[Shedhunter]

You can see that the Limerock piece is a dark maroon to brown color, where as the beach cobble has alot more red in it. But being a glacial cobble, I don't think there's anyway to know it's source. I'm sure that neither of these pieces are heat treated in any way.

[CMD]

Hopefully, I can show that Limerock photo to one of our local mineral hunters some time. Seeing the banding, does make me wonder if it is actually Limerock agate, which is banded. I'm not experienced enough to make the call...

[-=METACOM=-]

I don't think I ever saw the smaller one... I don't know how you resist the urge to spall those.

[Shedhunter]

Charlie, I hadn't thought of that possibility, but I guess it could be agate. If you get any new info or opinions I'd love to hear about it.