Thank for that I'm not to clued up on posting pics just yet, I have a few other stones and this is the only one showing signs of splits any idea of cause ? I would have not have thought moisture or frost would cause this it certainly has never been frozen. I have only recently obtained this one superficially it seemed ok perhaps it may have been roughly handled in it's past, it was certainly never used and perfectly flat but slightly pot marked I almost passed it by but after lapping flat it was as smooth as glass and gave a good edge. Would the lapping have released any stresses that may have caused this?