Hypertext Webster Gateway: "chert"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Chert \Chert\, n. [Ir. ceart stone, perh. akin to E. crag.]
(Min.)
An impure, massive, flintlike quartz or hornstone, of a dull
color.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hornstone \Horn"stone`\, n. (Min.)
A siliceous stone, a variety of quartz, closely resembling
flint, but more brittle; -- called also {chert}.
From WordNet (r) 1.7 (wn)
chert
n : variety of silica containing microcrystalline quartz
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