obsidianite
Americannoun
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Also called helenite. a glassy gemstone made by melting volcanic ash and rock and then rapidly cooling it before it can crystallize: a form of obsidian produced artificially in various colors, including green, red, and blue, as determined by other trace minerals combined with it.
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Rare. a tektite.
Etymology
Origin of obsidianite
First recorded in 1895–1900
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