Sentence Examples

  • From the 1700s chert was used for grinding calcined flint, a product used in pottery manufacture.
  • The upper beds of the third limestone are often dark colored, and contain layers of black chert in nodules.
  • The pieces of gray chert were found on the tourist path below slopes too steep for human habitation.
  • Figure 5. The aging process of Casa Montero 's cherts: X-Ray diffraction pattern of opal and opaline chert obtained from the same nodule.
  • In fewer instances, layers of the limestone seem to be converted into white chert, called china stone.

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