Pitchstone

Pitchstone

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Credit: MARK A. SCHNEIDER/SCIENCE PHOTO LIBRARY

Caption: Pitchstone is a volcanic (extrusive) igneous rock formed by the rapid cooling of rhyolitic lavas, and has a resinous or pitchy appearance. It has a glassy, aphanitic texture.

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Keywords: aphanite, aphanitic, extrusive, formation, geology, glassy mineral, hand sample, igneous, mineral, mineralogy, pitchstone, resinous mineral, rock, sample, silhouettable, specimen, stone, volcanic rock, volcano

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