A piece of chert.
chert definition by Webster's New World
an extremely dense type of quartz, including jasper and flint, having a dull, opaque luster and made up of microscopic crystals
Origin: ; from uncertain or unknown; perhaps
chert definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- A variety of silica that contains microcrystalline quartz.
- A siliceous rock of chalcedonic or opaline silica occurring in limestone.
Origin: Origin unknown.
- chertˈy adjective
chert - Science Definition
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.