Thread: Maybe someone has an idea what this stone is?

So I bought a Japanese natural stone from a site that deals in second hand tools and they had this stone up for sale. They described it as a relatively soft stone that's also fast from the Kyoto region and in the 4000-5000 range. It was only €70 so I ordered it thinking it would be a good stone for my chisels and plane blades. Well, the description was all wrong, this is a hard stone that leaves a highly polished edge. If I had to guess I'd say it's at least the equivalent of a 10k synthetic stone and I can shave straight of this stone. This the first Japanese natural I have (I'm used to coticules for my razor) and I was wondering if someone might be able to tell me more about it?

Kiita of some kind maybe from who knows what mine. Love them chisel marks indicates hand finishing for a reason.
MIke

Apparently those chisel marks were used as a form of decoration and they were reserved for high quality stones.