Weird. I like black sand. I spend a lot of time on La Gomera (closest island to Tenerife, about 30 km away) and actually love the sand there. There's also ba

Weird. I like black sand. I spend a lot of time on La Gomera (closest island to Tenerife, about 30 km away) and actually love the sand there. There's also basically nothing but sand: no shells, few rocks, no random fish carcasses (presumably this is what you mean by "clean"). I'm usually there in the middle of winter (25º C-ish) when the sand being warm is a plus. Usually there aren't a ton of fish around the islands because they're volcanoes: the mountain extends down into the water too, and there's not much of a shelf of shallow water around the islands. It gets deep fast. I wonder if something in dumping the sand also extended the amount of shallow water there.