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I have never seen the black stuff, but I have bought the regular CaribSea crushed coral. It is a bit coarser than pool filter sand, and a lot coarser than salt, but I'd still say it's more of a coarse sand than a fine gravel.

The catch seems to be that it's rather pricey - $30 for 20 pounds. Black 3M Color Quartz and Spectra Quartz tend to be around $20 for 50 pounds, that is 2.5 times cheaper.
 
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