Andesite

Andesite

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Credit: MARK A. SCHNEIDER/SCIENCE PHOTO LIBRARY

Caption: Andesite is an igneous rock consisting of plagioclase feldspar and hornblende, biotite or augite. It is extrusive, formed when lava reaches the surface of the earth through fissures, vents or volcanoes. It's texture is aphanitic (microcrystalline); mineral grains are too small to be seen by the naked eye.

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

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