a. [f. CHERT + -Y1.] Of the nature of chert; having chert as a constituent.

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1772.  Pennant, Tours Scotl. (1774), 161. The rocks are hard and cherty.

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1842.  H. Miller, O. R. Sandst., ix. (ed. 2), 206. It [the limestone] abounds in masses of a cherty, siliceous substance.

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1850.  Lyell, 2nd Visit U.S., II. 17. Cherty sandstone.

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