chert: meaning, definition, pronunciation and examples
Very Low (C2+)Technical / Academic / Geological
Quick answer
What does “chert” mean?
A hard, fine-grained sedimentary rock composed of microcrystalline quartz.
Audio
Pronunciation
Definition
Meaning and Definition
A hard, fine-grained sedimentary rock composed of microcrystalline quartz.
A common type of rock found in limestone formations, often used historically for making stone tools due to its conchoidal fracture; can refer to flint-like material.
Dialectal Variation
British vs American Usage
Differences
No significant usage differences. The term is technical and used identically in geological contexts in both varieties.
Connotations
Neutral, purely scientific/technical term.
Frequency
Equally low frequency in both UK and US English, confined to geology, archaeology, and related fields.
Grammar
How to Use “chert” in a Sentence
N of chert (a layer of chert)ADJ + chert (nodular chert)chert + N (chert tool)Vocabulary
Collocations
Examples
Examples of “chert” in a Sentence
adjective
British English
- chert-rich limestone
- chert-bearing strata
American English
- chert-rich limestone
- chert-bearing layers
Usage
Meaning in Context
Business
Not used.
Academic
Used in geology, archaeology, and earth science papers to describe rock types and tool-making materials.
Everyday
Virtually never used in casual conversation.
Technical
Core term in geology for a specific sedimentary rock; used in descriptions of stratigraphy, mineralogy, and prehistoric technology.
Watch out
Common Mistakes When Using “chert”
- Misspelling as 'chart'. Incorrectly using it as a general term for any hard stone.
FAQ
Frequently Asked Questions
Flint is a specific, dark variety of chert that occurs in chalk. All flint is chert, but not all chert is flint.
It is commonly found as nodules or layers within limestone and dolomite rock formations.
Because it fractures conchoidally (creating sharp edges), it was a primary material for making stone tools and weapons before the use of metals.
No, it is a specialised geological term. Most people would only encounter it in academic, scientific, or specific historical/archaeological contexts.
A hard, fine-grained sedimentary rock composed of microcrystalline quartz.
Chert is usually technical / academic / geological in register.
Chert: in British English it is pronounced /tʃɜːt/, and in American English it is pronounced /tʃɝːt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a CHART of rocks; CHERT is the hard, sharp one used for tools.
Conceptual Metaphor
Often metaphorically associated with hardness, antiquity, and primitive technology.
Practice
Quiz
What is chert primarily composed of?