Thread: Old stone found

I found this old hone in an old home my buddy moved in to it had lots of very old things in it this was one of them . The one picture is what it looked like when I found it and the other two are what it looked like after 30 mins and 120 grit sand paper . My question is , is there a way to tell what it is or if it would be good for razors ? I have not taken up honing yet I'm waiting to get the feel of everything else first but I will most definitely be taking it up soon . Is this something to try as a finishing stone ? Any input is appreciated . Thanks much