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出典:Wiktionary
From being black-coloured sand
black sand (複数形 black sands)
出典:Wikipedia
出典:『Wikipedia』 (2011/08/11 10:17 UTC 版)
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.
Blacks and