File:Andesite pmg ss 2006.jpg

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Siim Sepp, 2006

Volcanic rock andesite. Photomicrograph with crossed polars. The width of the view is approximately 0,15 cm. Porphyritic texture. Main phenocrysts are plagioclase, hornblende and magnetite. Groundmass is composed of volcanic glass, plagioclase, hornblende, magnetite and biotite.

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Andesite

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