Rhyolite

Rhyolite

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Credit: MARK A. SCHNEIDER/SCIENCE PHOTO LIBRARY

Caption: Hand sample of Rhyolite, a volcanic (extrusive) igneous rock consisting of microcrystalline potassium feldspar, quartz, and minor accessory minerals. Rhyolite has an aphanitic texture; the mineral grains are too small to be seen by the naked eye.

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

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