MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Quartz seam in schist, close-up. Seams of quartz form in fissures or cracks in existing rocks, here a Cevennes schist. This black metamorphic rock, used as roof tiles, contains chlorite, and black and white micas. This specimen is part of the Geoscope geological park, located between Les Monts-Vert and Albaret-Sainte-Marie, central France.
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