Yeah, goofs aside these are just river pebbles. Surface weathering can yield really deceptive colors and patterns, but they look a bit quartzite ish. That said, sometimes these stones can yield interesting cabochons. I've cut a few I collected from drain gravel at college which turned out neat.
Yeah, I took some to my mineralogy professor when I was a freshman and that was what he told me. When I cut them open most lookes veey different inside.
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