larson1951
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In the Dakotas, Besant/Sonota groups traded with the Hopewell cultures to the east. That was around 2000 years ago.uniface said:Flourite would have scratched easily.
Jade averages (as I recall) around 6.5 on the Mohs' scale (just a bit less hard than quartz), so it looks like that's what you've got. Pretty important finds, I'd think, seeing as it probably came from the Pacific Northwest.
This, in turn, would seem (?) to narrow the time frame down to when the Hopewell culture was in high gear, bringing in stuff from all over the country (shells from Florida, obsidian from Wyoming) and trading just as far for it. Neanderthal could tell you better, since he knows your area and that time.
