Chert

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Brush Creek Chert.jpg
This sample of Brush Creek chert measures approximately 2.5" x 2.5" (6.35 x 6.35 cm).

Chert is an impure form of flint. Some people believe the opposite --- that flint is a variety of chert. In either case both minerals are varieties of quartz. The name chert is dialectal English; its origin is unknown. The mineral occurs in various colors including white, brown, yellow and gray. Chert is more brittle than flint and cannot be worked as well as flint.

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