Some black sands are magnetic, some aren't. I don't remember which are, but I've read the carib sea hawaiin is not.
From wikipedia (not the best source I know but I'm lazy and don't remember where else I read about it):
Black sand is sand that is black in color. One type of black sand is a heavy, glossy, partly magnetic mixture of usually fine sands, found as part of a placer deposit. Another type of black sand, found on beaches near a volcano, consists of tiny fragments of lava.
Tanks with black sand look awesome when they're clean, and the corals really do Pop. But when the sand gets dirty... Well think of black and white cars. Which show the dirt more? I always thought it was strange that black cars showed the dirt more.
Is lighting an issue with black sand? Will it reflect less light back up, or is that too small an issue to matter?
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