Definitions for: Chert

[n] variety of silica containing microcrystalline quartz

Webster (1913) Definition: Chert, n. [Ir. ceart stone, perh. akin to E. crag.]
(Min.)
An impure, massive, flintlike quartz or hornstone, of a dull
color.

See Also: silica, silicon dioxide, silicon oxide, taconite