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I am still acting the devil's advocate, but did you ever reflect that you can only lap something very badly with a piece of hardened steel and abrasive grains, which just roll freely about? The...

What puzzles me is, if garnets will cut steel in the slurry, why wouldn't they do so when merely embedded in the stone? If the rest of the stone would cut steel, why wouldn't it do so in the slurry? ...