Dictionary of Human Evolution and Biology

  • -id > 9:3


Impure cryptocrystalline siliceous rock found in sedimentary limestone; often used in stone tool manufacture, as at Olduvai Gorge. Because chert tends to splinter, forming flat fractures, it forms cruder tools than those made of flint. Its primary component is silica, and it is considered an opaque variety of chalcedony.

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