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fulgurite

Rare / Specialist
UK/ˈfʌlɡjʊraɪt/US/ˈfʊlɡjəˌraɪt/ or /ˈfʌlɡjəˌraɪt/

Scientific / Technical

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Definition

Meaning

A hollow, glassy tube or crust formed in sand or rock by lightning strike.

A natural, often branching, tube of fused silica (lechatelierite) created when a powerful lightning bolt melts and fuses sand or soil. Also used metaphorically to describe something brittle, glassy, or formed by intense, sudden energy.

Linguistics

Semantic Notes

Term is highly specific to geology, mineralogy, and meteorology. It refers strictly to the natural product of a lightning strike, not man-made glass. The plural is 'fulgurites'.

Dialectal Variation

British vs American Usage

Differences

No significant lexical or spelling differences. Pronunciations differ slightly.

Connotations

Identical scientific meaning; no cultural differences.

Frequency

Equally rare and technical in both dialects.

Vocabulary

Collocations

strong
sand fulguriterock fulguritefused silicalightning-formedbranching fulgurite
medium
glass tubenatural glassformed by lightninghollow tube
weak
rare specimengeological samplemuseum piecedesert find

Grammar

Valency Patterns

[The] lightning created/formed [a] fulgurite[A] fulgurite was found [in] the sandThey collected [the] fulgurite [from] the site

Vocabulary

Synonyms

Strong

lechatelierite tubefused silica tube

Neutral

lightning tubepetrified lightning (colloquial)

Weak

glass formationlightning fossil

Usage

Context Usage

Business

Virtually never used.

Academic

Used in geology, earth science, and meteorology papers describing mineral formations from electrical discharge.

Everyday

Extremely rare; might appear in documentaries or popular science articles about extreme weather.

Technical

Precise term in mineralogy for a specific type of natural glass (lechatelierite) formed by lightning.

Examples

By Part of Speech

adjective

British English

  • The fulguritic glass was exceptionally fragile.
  • They studied the fulguritic formation.

American English

  • The sample showed a fulguritic structure.
  • Fulguritic material lined the interior of the tube.

Examples

By CEFR Level

A2
  • Lightning can make glass in the sand. This glass is called fulgurite.
B1
  • The museum had a piece of fulgurite, a glass tube formed when lightning hit the beach.

Learning

Memory Aids

Mnemonic

FULGURITE sounds like 'FULL of GLASS' + 'RIGHT' where lightning struck. Imagine a bolt of lightning striking the sand and making a tube FULL of GLASS RIGHT at that spot.

Conceptual Metaphor

A SCAR or FOSSIL of energy; a BRITTLE MEMORY of a violent event.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Avoid direct calques like *фульгурит*. The Russian term is 'фульгурит' or 'ископаемая молния'. It is not a common or general word for glass.

Common Mistakes

  • Pronouncing it as /fʊlˈɡʊraɪt/ (misplacing stress).
  • Confusing it with man-made slag glass or obsidian.
  • Using it as a verb (e.g., 'The sand was fulgurited').

Practice

Quiz

Fill in the gap
A is a natural glass tube formed when lightning strikes sandy ground.
Multiple Choice

What is a fulgurite?

FAQ

Frequently Asked Questions

No. Obsidian is volcanic glass cooled from lava. Fulgurite is silica sand or rock instantly melted and fused by lightning.

Technically, yes, by using extremely high electrical currents in a lab, but the term is reserved for naturally occurring formations.

It has scientific value and is collected by mineral enthusiasts, but it is not a precious gemstone.

In sandy deserts, on beaches, or in sandstone regions that experience frequent thunderstorms.