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if it's finer then the Dragon Tongue it could be the third in this 3 stone package (stil don't realy know how to call that stone) this third one is usually lighter then the DT but these stones all...

looks like a Welsh Slate type of hone, I would guess a Dragon Togue when looking at the colors in your second image, it looks like it has been abused quite a bit, where did you get it?