I borrowed the stone and will probably have it for only another day. The question is, what is it?
Hopefully, I will be able to post some photos from my phone since I'm traveling and do not have access to computer.
The coloring is a light gray. When I first Saw it, I assumed that it was a fine crystolone stone.
It never occurred to me that this might be a water stone, so I applied some mineral oil that I have where I am, and gave it a go.
This very quickly pulled up a lot of mud from the stone. I had already been using a crstolone stone since that is what I have available.
This left a pretty nice edge and it did it pretty quickly, but I'd already worked it pretty well on the fine crystolone stone.
I will post and then see if I can add photos and a reply