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Can a natural stone be comparable to a 12k Naniwa for what I need?

Maybe… but doubtful, depends on the stone. Natural stones are… natural and no 2 are alike, all 12k Super Stone will deliver the...

Not really. The stone appears to be a slate most probably in the 5-8k grit range, more probably in the lower range. The Red & Black pastes are higher grits, most probably Red(Iron Oxide) and Black...