for now until you clean them up the one to the right looks like an indian stone next to that one is a soft ark and the other two stones look to be maybe silicone carbide. cleaning use easy off over cleaner let it sit on them for 1/2 an hour after that take them one at a time and put them in a old pot with a rag at the bottom of the pot pour water into the pot and heat for about 15 mins ( or until there isnt anymore oil coming out of the stone)around 160 degrees with a detergent let the stone cool down to room temp and lap then you'll see what you got