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Yeah, that's what they use. I use a DMT for all my heavy stone work. My experience with stones on paper was that I needed a truck load of paper to do what my DMT does in a few minutes.

Silicone carbide on a stone slab (especially marble) is not going to last very long. Much better on glass but even then it will "dish" quickly. I wonder if Harbor Freight sandpaper is done after one...