Ernie, I have 4 of them and also a black translucent arkie, an old purple slate, several blue green slates and they are nowhere as fine or as fast as the apache. this stone needs no slurry, I tried it both ways and with the slurry it cuts no faster nor smoother. my straight razors come off with the bevel polished to a mirror to the eye and I use a 1k,4k,8k progression. I have a coti, most agree it is around 8k and I finish the straights on the apache off the coti. almost thuri, almost ex fine j nat. the darker ones are even faster than the greys. it is close to a owhee jasper I had till it self destructed, this stone ios very much harder than jasper. get a smaller cheaper one and try it. I don't have any connection with the man other than bought a few stones from him, Terry seems like a nice guy and there were reviews on badger and blade. only one hone was bad and he replaced it, it is a natural and you may get a bad one every once and awhile. main thing is he stands behind them. I have three darker ones and one light grey, I use the darker ones more. I have no way of verifying the grit nor the hardness but if you saw these bevels in person you would understand.