Fred,
You should put all those great artifacts that you posted this year and put them together in a display frame. We’d love to see them all together.
The two areas where your hand would be while using this one are both smooth, unlike the rough surface of the rest of the rock for one thing. Almost like it spent a lot of time in someone’s hand, maybe.... scraping hides? Lol.
The rough areas are where it naturally detached / cracked off of a vein (or from another source) more recently than the smooth areas Fred. The smooth areas are from natural weathering/erosion. I love your enthusiasm though!