MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Two-mica granite, close-up. This rock type is so-called because muscovite (a white mica) and biotite (a black mica) are present, along with quartz and feldspar minerals. Photographed at the Geoscope geological park, located between Les Monts-Vert and Albaret-Sainte-Marie, central France.
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