Obsidian is a kind of black glass formed when the heat of a volcano melts the silica material in sand.

VOA: special.2009.09.16

She soon began making movies. Lena Horne said that she was able to make movies because she was the kind of black person that white people could accept.

VOA: special.2010.05.23

One is a kind of deep-water black coral called Leiopathes.

VOA: special.2009.05.12