very hard, hit them together get sparks, find many when working the ground also many other Native American artifacts , these rocks are not native to my area
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Just odd that people would carry rocks around to make a fire pit, wish I could find more information, we have no rounds rocks in the area only slate/shale we call it slate (no clue) very shallow soils and tons of arrow heads and quartzLooks like fire burned rock, probably quartzite used around the old campfires.