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Petrography is the scientific description of the composition and texture of rock, including the systematic classification of rocks. Petrographic examination of hardened concrete—a man-made rock—is the examination of concrete by the techniques used in petrography to determine the formation, composition, and internal structure of the concrete and to classify it as to its type, condition, and serviceability.
Geologist; Chief, Structures Laboratory, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss.