chert

Noun

Meaning

An impure, massive, flintlike quartz or hornstone, of a dull color.

Source: Webster's dictionary

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Flint (a type of chert unique to chalk) is very common as bands parallel to the bedding or as nodules embedded in chalk. Source: Internet

Grains can include quartz or chert rock fragments. Source: Internet

It includes large flint and chert bifacials that may be of Heavy Neolithic origin. Source: Internet

The oxygen then combined with dissolved iron in Earth's oceans to form insoluble iron oxides, which precipitated out, forming a thin layer on the ocean floor, which may have been anoxic mud (forming shale and chert). Source: Internet

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