coesite: meaning, definition, pronunciation and examples
C2Technical / Scientific
Quick answer
What does “coesite” mean?
A dense, high-pressure form of quartz (silicon dioxide) created under extreme conditions.
Audio
Pronunciation
Definition
Meaning and Definition
A dense, high-pressure form of quartz (silicon dioxide) created under extreme conditions.
A polymorph of silica, forming from quartz under immense pressure, such as from meteorite impacts or deep within the Earth's mantle. It serves as a diagnostic mineral for confirming impact craters and studying high-pressure geological processes.
Dialectal Variation
British vs American Usage
Differences
None in meaning or spelling.
Connotations
None beyond the scientific context.
Frequency
Exclusively used in specialised geology/mineralogy contexts in both varieties.
Grammar
How to Use “coesite” in a Sentence
The [rock/impactite] contains coesite.Coesite was [found/identified/detected] in the sample.Coesite forms under [conditions of extreme pressure].Vocabulary
Collocations
Usage
Meaning in Context
Business
Not used.
Academic
Used in research papers and lectures in geology, mineralogy, and planetary science to discuss high-pressure metamorphism or impact crater evidence.
Everyday
Virtually never used.
Technical
The primary context. Used in reports on metamorphic petrology, shock metamorphism, and diamond-bearing rocks from the mantle.
Vocabulary
Synonyms of “coesite”
Neutral
Weak
Vocabulary
Antonyms of “coesite”
Watch out
Common Mistakes When Using “coesite”
- Mispronouncing it as 'co-ess-ite' or 'coe-site'. The correct pronunciation follows the name 'Coes'.
- Using it as a general term for any dense mineral.
- Confusing it with stishovite, another high-pressure silica polymorph.
FAQ
Frequently Asked Questions
It is named after Loring Coes Jr., the American chemist who first synthesized it in a laboratory in 1953.
It is found at meteorite impact craters (like the Barringer Crater) and in certain ultra-high-pressure metamorphic rocks, such as those from continental collision zones.
Yes, it is relatively rare because the extreme conditions required for its formation are not common at the Earth's surface. Its presence is a key diagnostic tool.
They have the same chemical formula (SiO2) but different crystal structures. Coesite has a much denser, more compact structure formed under immense pressure, whereas quartz has a more open structure stable at surface conditions.
A dense, high-pressure form of quartz (silicon dioxide) created under extreme conditions.
Coesite is usually technical / scientific in register.
Coesite: in British English it is pronounced /ˈkəʊ.saɪt/, and in American English it is pronounced /ˈkoʊ.saɪt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: COESite = COnditions of Extreme Squeezing for SIllicATE. It's quartz that got squeezed incredibly hard.
Conceptual Metaphor
A 'pressure fingerprint' or a 'shock-wave fossil'.
Practice
Quiz
What is the primary significance of finding coesite in a rock outcrop at the Earth's surface?