Thread: New stone ID please

Hello again, I won this on Ebay, at first I bid for a coticule, but it seems to be some kind of different stone.Is 6 6/8 long, 1 1/2 wide,very soft,easy to lap,slurry is orange and smell like mud,not like a coticule.I try it with a Henkels, with slurry is give a nice feedback like a fast coticule,but the slurry is same color not dark even after 200 X strokes.The edge is very keen,HHT1
I did not shave yet.What can be? I have few coticule, this is not a coticule for sure,at least not one I know. And the smell is a very distinct mud smell.Is look like is glued on a piece of slate.
Thank you for your inputs.
Regards
Livio