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You are here: Index ObsidianThe commonest type of volcanic glass, usually black, but sometimes red or brown in colour formed by the rapid cooling and solidification of granite magma. Properties Etymology after Obsius, a Roman who supposedly discovered it or a similar mineral. Origin of the word Obsidian at Etymonline.com General Reference Obsidian at Wikipedia Images Google Image Search for Obsidian Yahoo Image Search for Obsidian You are here: Index |