Cut surface of amygdaloidal andesite rock

Cut surface of amygdaloidal andesite rock

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Credit: GEORGE BERNARD/SCIENCE PHOTO LIBRARY

Caption: Andesite. Cut surface of amygdaloidal andesite, a type of volcanic rock formed from solidified lava. Gas bubbles in the lava (called amygdales) in this sample have filled with crystalline material, creating coloured patches. Andesite is a fine- grained volcanic rock consisting of the mineral plagioclase feldspar with biotite, hornblende or pyroxene. Magnification x0.5 at 35mm size.

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Keywords: amygdale, amygdaloidal andesite, andesite, earth science, geological, geology, igneous rock, in andesite rock, rock, rocks, type, volcanic rock

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