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probably. It might just be some random crap stone mixed in. Go outside and grab a rock and try to hone on it. see if the razor digs in. :w

I have one shapton (and I want MORE MORE MORE), a 1k, and I lap it with the DMT 325 and it works great as far as I can tell.

I have heard the chinese 12k aren't always pure - ie aren't always pure 12k stone. So you may have gotten a lemon. You get what you pay for sometimes. Sounds like you are on the way to a better...