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obsidian

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{adj: volcanic} igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt
"volcanic rock includes the volcanic glass obsidian"

{n: Clovis culture} the Paleo-American culture of Central America and North America; distinguished chiefly by sharp fluted projectile points made of obsidian or chalcedony

{n: obsidian} acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces


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