allophane: meaning, definition, pronunciation and examples
C2Technical / Scientific
Quick answer
What does “allophane” mean?
An amorphous hydrous aluminium silicate clay mineral, often found in weathered volcanic ash or soils.
Audio
Pronunciation
Definition
Meaning and Definition
An amorphous hydrous aluminium silicate clay mineral, often found in weathered volcanic ash or soils.
A non-crystalline, glassy mineral of variable composition, important in soil science and geology for its role in weathering processes and its ability to adsorb certain ions.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or spelling. The technical definition is identical.
Connotations
None beyond its technical meaning.
Frequency
Extremely low frequency in both dialects, confined exclusively to specialist literature.
Grammar
How to Use “allophane” in a Sentence
Allophane is found in [location/soil type]Allophane forms from [parent material]The sample contains allophaneVocabulary
Collocations
Examples
Examples of “allophane” in a Sentence
adjective
British English
- The allophanic material was analysed.
- Allophane-like properties were observed.
American English
- The allophanic properties affect soil chemistry.
- An allophane-rich horizon was identified.
Usage
Meaning in Context
Academic
Used in geology, soil science, and environmental science papers to describe specific mineral components of soils and sediments.
Everyday
Virtually never used in everyday conversation.
Technical
The primary context. Precise term for a specific mineral with variable SiO2/Al2O3 ratio, important for its high surface area and anion adsorption capacity.
Vocabulary
Synonyms of “allophane”
Neutral
Weak
Vocabulary
Antonyms of “allophane”
Watch out
Common Mistakes When Using “allophane”
- Misspelling as 'alophane' or 'allophone'.
- Using it as a general term for clay.
- Pronouncing it with stress on the last syllable (/æləˈfeɪn/).
FAQ
Frequently Asked Questions
No, it is not ubiquitous. It is most commonly found in specific environments, particularly soils derived from volcanic ash (Andisols) and some weathered rocks.
Both are amorphous aluminosilicates, but imogolite has a distinct, paracrystalline tubular structure, while allophane is truly amorphous (non-crystalline) and often spherical.
Yes, it is often mistakenly written or heard as 'allophone', which is a linguistics term for a phonetic variant of a phoneme.
Due to its amorphous structure, it has a very high specific surface area and variable charge, which gives it a significant capacity to retain nutrients (like phosphate) and water, influencing soil fertility and management.
An amorphous hydrous aluminium silicate clay mineral, often found in weathered volcanic ash or soils.
Allophane is usually technical / scientific in register.
Allophane: in British English it is pronounced /ˈæləfeɪn/, and in American English it is pronounced /ˈæləfeɪn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'ALL OF' it is a 'PHANE' (a mineral appearing glassy or shiny). ALL-OF-PHANE → allophane.
Practice
Quiz
In which field is the term 'allophane' most commonly used?