ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a thin section of 'Greywacke', a sedimentary rock composed of variously sized fragments in a generally fine matrix. This is typical of deposited materials which have not been transported far from their source & therefore have had little time to become smooth & round through weathering. This specimen is from Lendalfoot, UK. Horizontal object size 4.0 mm.
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