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Yeah, I don't think my mystery stone is a CF. Mine is a very fine hard stone that would produce no slurry on its own. It was originally used years ago in an engine shop where it was fixed to a...

Nice stone. It's hard for me to tell on either of my monitors, but are those areas of purple and is the overall hue of the stone a grayish?

I've been trying to ID the following stone I picked...