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Greetings @william-dail ! Your specimens look like chert fragments.

Looks like spent cores from lithic projectile point manufacturing. If so there should be lots of “debitage” laying around. Basically the stone man’s sawdust. Small little chips with conchoidal breaks. Like when a BB gun hits a window. It leaves a round fracture. There will also be some hammer stones. They are noted by being baseball size or smaller. Evidence of impact damage around the edges. Several broken up pieces of these hammer stones are usually lying around the area.