Chert nodules in chalk

Chert nodules in chalk

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Chert nodules in chalk. Chert is a fine-grained silica-rich sedimentary rock. These nodules formed by concretionary enrichment of the silica (silicon dioxide) after the chalk had been deposited in marine environments.

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Keywords: accumulation, calcium carbonate, chalk, chemical, chemistry, chert, close-up, concretion, concretionary, concretions, detail, earth science, enriched, formation, formations, geographical, geography, geological, geology, marine environment, mineral, mineralogy, minerals, nature, nodule, nodules, sample, silica, silicon dioxide, specimen, still life, still-life

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