Definition of chert in English:


Syllabification: chert
Pronunciation: /CHərt, CHat


A hard, dark, opaque rock composed of silica (chalcedony) with an amorphous or microscopically fine-grained texture. It occurs as nodules (flint) or, less often, in massive beds.
More example sentences
  • The sedimentary lenses are composed of limestone, sandstone, siltstone, mudstone, shale, chert and well-bedded calci-turbidite.
  • It comprises turbiditic elastic rocks with cherts, pillow lavas and greenstones.
  • In fact, seventeen of the fifty-seven sites are specifically listed for agate, chalcedony, chert, jasper, or petrified wood.


late 17th century (originally dialect): of unknown origin.



More example sentences
  • Nevertheless, many tectonic ironstones are rather massive, cherty rocks, suggesting that early structural fabrics were annihilated by late-stage chert replacement.
  • These fracture zones occur as parallel layers alternating with cherty lithons, typically 5 mm wide, giving the rock a banded appearance.
  • The cherty carbonate rocks are resistant to weathering, and regions underlain by them may stand above the surrounding terrain.

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Word of the day retroflex
Pronunciation: ˈretrəˌfleks
turned backward