I got this stone from my buddy last night it makes my 2k stone feel like 200 I lapped it today thus thing feels like glass I'm guessing it's something like a 4k/6k or 4k/8k stone the darker side is a dark red and leaves a reddish pink slurry and the other side leaves a creme colored slurry at first I thought it was an Arkansas stone but after some looking around I think it may be a belgian coticule it measures 5"x2 1/4"x5/8"



I can get more pictures if needed

Thanks guys