laumontite
RareTechnical / Scientific
Definition
Meaning
A white, grey, or colourless zeolite mineral, often occurring as glassy prismatic crystals or fibrous masses in cavities in volcanic rocks.
A hydrous calcium aluminium silicate mineral (CaAl₂Si₄O₁₂·4H₂O) belonging to the zeolite group, named after the French mineralogist Gillet de Laumont. It forms in low-temperature hydrothermal environments and is sometimes used in scientific studies of rock formation and water-rock interactions.
Linguistics
Semantic Notes
Used almost exclusively in geology, mineralogy, and related earth sciences. It is a proper noun turned common noun via the standard mineralogical suffix '-ite'.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, spelling, or usage. The term is international scientific vocabulary.
Connotations
Neutral; purely denotative of a specific mineral.
Frequency
Equally rare in both varieties of English, confined to specialist literature.
Vocabulary
Collocations
Grammar
Valency Patterns
The [rock/specimen] contains laumontite.Laumontite occurs in [cavities/veins].Laumontite is associated with [other minerals].Vocabulary
Synonyms
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in geology and mineralogy research papers, textbooks, and field descriptions.
Everyday
Virtually never used.
Technical
The primary register. Used in geological surveys, mineral identification guides, and petrological analyses.
Examples
By Part of Speech
adjective
British English
- The laumontite-bearing rock was examined.
- A distinct laumontite habit was observed.
American English
- The laumontite-bearing rock was analyzed.
- A distinct laumontite habit was observed.
Examples
By CEFR Level
- The geologist showed us a rock with shiny laumontite inside.
- Under the microscope, the laumontite appeared as delicate, prismatic crystals lining the cavity.
- The presence of laumontite indicates that hydrothermal fluids once passed through these basalt flows.
- The paragenetic sequence revealed that laumontite crystallised after the quartz but prior to the calcite deposition.
- Advanced microprobe analysis was employed to determine the precise cation-exchange capacity of the sampled laumontite.
Learning
Memory Aids
Mnemonic
Think: 'Laumont's light' - as it's named after Laumont and often forms light-coloured, glassy crystals.
Conceptual Metaphor
A mineral as a witness to geological history; a crystalline record of hydrothermal activity.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid a direct phonetic transliteration like 'лаумонит'. The standard Russian geological term is 'ломонтит' (lomontit).
- Do not confuse with more common zeolites like 'цеолит' (zeolite).
Common Mistakes
- Misspelling as 'lamontite', 'laumonite', or 'laumentite'.
- Incorrect pronunciation with stress on the second syllable (e.g., /laʊˈmɒntaɪt/).
Practice
Quiz
Laumontite is primarily classified as which type of mineral?
FAQ
Frequently Asked Questions
It has no major industrial use. Its primary importance is scientific, helping geologists understand hydrothermal processes and low-grade metamorphism.
It is commonly found in cavities and fractures of basaltic and andesitic volcanic rocks, as well as in some metamorphic rocks and ore veins.
It is identified by its vitreous lustre, perfect prismatic cleavage, typical white to colourless appearance, low hardness, and its association with other zeolites. Definitive identification usually requires X-ray diffraction or optical microscopy.
Not commercially. It is sometimes collected by mineral enthusiasts for its aesthetic crystal forms, but it is not a precious or semi-precious gemstone.