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It is unlikely you'll need to spend hours lapping it before a positive ID can be had on the stone, unless it is an unknown specimen. You could use oven cleaner to remove the grease then coarse loose...

Clearly a CF. Undoubtedly!!!!

What you are asking is akin to showing me a picture of a garage, telling me there is a car inside then asking me what car is in there. Not to knock you, but do...