adularia
Very Rare / TechnicalTechnical / Scientific
Definition
Meaning
A common, colourless or white variety of potassium feldspar (orthoclase) with a pearly or vitreous lustre.
In historical mineralogy, a specific type of feldspar valued for its optical properties and sometimes mistaken for moonstone; also used in some contexts to refer to a semiprecious ornamental stone.
Linguistics
Semantic Notes
The term is almost exclusively used in geology, mineralogy, and historical texts on gemstones. It lacks figurative or metaphorical extensions in general language.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is identical.
Connotations
None beyond its strict mineralogical definition.
Frequency
Extremely rare in both varieties of English, confined to specialist literature.
Vocabulary
Collocations
Grammar
Valency Patterns
The [mineral] was identified as adularia.Adularia is a [type/kind/variety] of feldspar.Vocabulary
Synonyms
Strong
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in geological and mineralogical papers and textbooks.
Everyday
Virtually never used.
Technical
Primary context. Used to specify a particular crystalline form of orthoclase.
Examples
By Part of Speech
adjective
British English
- The adularia crystals were examined.
- An adularia specimen was catalogued.
American English
- The adularia sample was pure.
- We noted its adularia composition.
Examples
By CEFR Level
- The geologist identified the white mineral as adularia.
- Adularia is sometimes confused with common quartz.
- Under cross-polarised light, the microcline exhibited a tartan twinning pattern distinct from that of adularia.
- The hydrothermal veins were primarily composed of quartz with subordinate adularia and chlorite.
Learning
Memory Aids
Mnemonic
Think of 'ADULAría' – a 'jewellery' (sound-alike) mineral found in the 'ADULA' mountains in Switzerland, where it was first described.
Conceptual Metaphor
None applicable.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation. It is a specific mineral name, not a general term for 'feldspar' (полевой шпат). 'Адулярия' is the direct Russian equivalent, but it is equally technical.
Common Mistakes
- Confusing it with 'adulation'. They are etymologically unrelated.
- Using it as a general term for any shiny white mineral.
- Mispronouncing it as /ˌædjuˈlɑːriə/.
Practice
Quiz
In which field is the term 'adularia' primarily used?
FAQ
Frequently Asked Questions
No, it is a common mineral. However, the variety 'moonstone', which exhibits adularescence, is a popular semiprecious gem, and some moonstone is adularia.
Adularia is a specific, often low-temperature, variety of orthoclase (potassium feldspar) characterised by its crystal habit and typical lack of visible twinning.
It is named after the Adula Mountain group (or Adula Alps) in Switzerland, where it was first described.
It would be highly unusual and likely confusing, as it is a specialist scientific term with no everyday application.