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Ok its not a natural but i still think coti and so the base is bbw or slate if its slate you cant use it on your razor .Do a test and see if you can raise a slurry on both sides the creamy white side...

It looks to be a natural coti and belgian blue stone i love mine and they are great for razors use the blue side first after you have got your bevel sorted and then go to the light side ,you will...