chert

[churt]
noun
a compact rock consisting essentially of microcrystalline quartz.

Origin:
1670–80; origin uncertain

cherty, adjective
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World English Dictionary
chert (tʃɜːt)
 
n
Also called: hornstone a microcrystalline form of silica usually occurring as bands or layers of pebbles in sedimentary rock. Formula: SiO2. Varieties include flint, lyddite (Lydian stone)
 
[C17: of obscure origin]
 
'cherty
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

chert
"flint-like quartz," 1679, of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
chert   (chûrt)  Pronunciation Key 
A hard, brittle sedimentary rock consisting of microcrystalline quartz. It is often reddish-brown to green but can also occur in a variety of other colors, especially white, pink, brown, or black. Chert often contains impurities such as calcium, iron-oxide, or the remains of silica-rich organisms. It usually occurs as nodules in limestone and dolomite and has curved fractures.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The sediments in this photo curve near the ends of chert pods.
Chert tool stone often was heated first, to improve its flaking qualities.
They preferred rocks such as chert, a type of flint, that can be chipped precisely.
Chert breaks into rounded surfaces with sharp edges.
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