lutite
Very low (specialised technical term)Highly technical, primarily geological science.
Definition
Meaning
A sedimentary rock composed primarily of clay- or silt-sized particles (less than 0.0625 mm in diameter); a general term for fine-grained detrital rocks.
In geology, a general term for consolidated or lithified fine-grained sedimentary rocks. The term is synonymous with 'mudrock' and encompasses specific types like shale (fissile), claystone (non-fissile), siltstone, and mudstone.
Linguistics
Semantic Notes
The term 'lutite' is a compositional term based on grain size, not mineralogy. It is the coarse equivalent of 'pelite', which is used in metamorphic geology. It is a 'root' term in classifications, where modifiers indicate composition (e.g., calc-lutite).
Dialectal Variation
British vs American Usage
Differences
No significant national difference in meaning or usage. The term is equally rare and specialised in both British and American geology.
Connotations
None. Purely descriptive, scientific term.
Frequency
Extremely low frequency in both variants. 'Mudrock', 'shale', or 'claystone' are more common in everyday geological discourse, even in technical contexts. 'Lutite' is often reserved for formal classifications and older literature.
Vocabulary
Collocations
Grammar
Valency Patterns
The [geological formation] consists predominantly of lutite.X is classified as a [calcareous] lutite.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Used almost exclusively in geological science papers, textbooks, and stratigraphic descriptions. Highly specialised.
Everyday
Never used in everyday conversation.
Technical
Core term in sedimentary petrology and stratigraphy for classification.
Examples
By Part of Speech
adjective
British English
- The lutitic layers show excellent laminations.
- A lutitic facies was identified in the core sample.
American English
- The lutitic intervals contain microfossils.
- This is a lutitic member of the formation.
Examples
By CEFR Level
- The dark layers in the cliff are a type of sedimentary rock called lutite.
- Geologists study lutite to understand ancient environments.
- The basin fill is dominated by calcareous lutite, suggesting deposition in a low-energy, deep-water setting.
- X-ray diffraction analysis revealed that the lutite is composed chiefly of illite and chlorite.
Learning
Memory Aids
Mnemonic
Think of 'LUTE' (a soft instrument) + 'ITE' (meaning rock). A 'soft rock' made of fine particles like clay and silt.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'лютик' (buttercup). The Russian geological term is 'пелитовая порода' or more specifically 'алевролит' (siltstone), 'аргиллит' (claystone). Direct translation attempts may lead to confusion.
Common Mistakes
- Pronouncing it as 'loo-tight' (/ˈluːtaɪt/) is less common than 'loo-tyte' (/ˈluːtʌɪt/).
- Using it in non-geological contexts.
- Confusing it with 'lucite' (a brand name for acrylic plastic).
Practice
Quiz
Which of the following is a specific type of lutite?
FAQ
Frequently Asked Questions
No, it is a highly specialised term used almost exclusively in geological science and is very rare in general English.
Lutite is a general term for all fine-grained detrital sedimentary rocks. Shale is a specific type of lutite that is finely laminated and fissile (splits into thin layers).
In most modern geological contexts, yes. 'Mudrock' is a more widely understood synonym, though 'lutite' remains correct in formal classifications.
Lutites are primarily composed of clay minerals, silt-sized quartz and feldspar grains, and often contain organic matter or carbonate cement.