Do you know what this stone is?

[woodwrightman]

I have a hard natural stone that is sand coloured. It is an oil stone but after lapping, which was hard work and slow, I bought it done flat. It cuts with a good feel with water giving a fine finish, not the finest I have seen though. The darker bit in the middle is where the stone is flat but the used surface has not been fully removed to any depth.

The stone underneath is a scythe stone an a natural one at that. I thought it was some kind of emery or man made because it glittered, but is obviously a natural, because of the banding.

This is a usb microscope picture of the sand coloured stone top is the lapped surface. The one underneath before lapping