Obsidian

Obsidian

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Credit: MARK A. SCHNEIDER/SCIENCE PHOTO LIBRARY

Caption: Hand sample of Obsidian, an extrusive igneous rock with a glassy appearance formed by the rapid cooling of rhyolitic lavas.

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Keywords: aphanite, aphanitic, earth science, extrusive, formation, geology, hand sample, igneous, mineral, mineralogy, obsidian, rock, rocks, sample, silhouettable, specimen, stone, volcanic rock

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