Indian artifacts used for skinning

This stone is not found in missouri I found it in the creek by my house in lake of the Ozarks mo the Ozarks Indians must've traded with Colorado Indians it's a very smooth dense stone and one aide was sharp at one point. I've been offered 600 but then I've been told not to take less than 2500....I'm start the price at 750 which is a good deal I'll price it down til I find somebody interested. Ok I brought the price down way further then my auctioneer wanted but I desperately need the money I'm trying to post competitively I had another profile with 5 stars and over 100 sales til it got hacked....I promise this stonebwas appraised 1 to 1300 hundred dollars I found it in my creek 22 years ago. It was used to skin meet and tapestries. And I kno it just looks like a rock but we don't have those black dense rocks in mo it must've been traded from the north.