What does fulgurite mean?
A fulgurite is a natural glass formation produced when a bolt of lightning strikes the ground and instantly melts the sand, soil, or rock in its path. The result is typically a thin, hollow, branching tube of fused silica, sometimes called 'fossilized' or 'petrified' lightning because it preserves the path the discharge took through the earth. The name derives from the Latin 'fulgur', meaning lightning, reflecting the phenomenon's origin. Fulgurites are scientifically valuable: they record the intensity and temperature of past lightning strikes, which can exceed 1,800 degrees Celsius at the point of impact. They are also prized by mineral collectors for their unusual appearance and scarcity, though most are extremely fragile and crumble easily when extracted from loose sand. While rarely encountered in casual speech, the term is firmly established in geology, mineralogy, and popular science writing about extreme weather.
nounA naturally occurring glass tube or crusty mass of fused material, typically sand or rock, created when a lightning strike discharges into the ground and melts it.
- A tubular mass of vitreous material formed when lightning melts sand, soil, or rock in its path.
"After the storm passed, the hikers discovered a delicate fulgurite branching through the sand dune."
"Scientists carefully excavated the fragile fulgurite to study the conditions of the lightning strike that formed it."
"Collectors prize fulgurites as rare physical evidence of nature's electrical power."
The plural follows the standard English pattern for nouns ending in '-e'.
"Several fulgurites were recovered from the beach after the thunderstorm."
When lightning strikes sand, it can fuse the grains into a hollow glass tube called a fulgurite — literally petrified lightning buried in the earth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fulgurite
The word fulgurite comes from the Latin 'fulgur', meaning 'flash of lightning', combined with the suffix '-ite' commonly used to name minerals and rocks. It entered scientific English in the late eighteenth century as geologists began classifying lightning-fused materials. The same Latin root gives English words such as 'fulgent' and 'effulgent', both relating to brilliant light or radiance.
How fulgurite is actually used
Fulgurite is a technical term used chiefly in geology and mineralogy; it is uncommon in everyday conversation but well established in scientific writing. Because fulgurites are extremely fragile and often hollow, the word frequently appears in contexts describing their rarity and delicacy.
Easily confused with fulgurite
A fulmar is a seabird, entirely unrelated to the fused-glass tube known as a fulgurite despite superficially similar spelling patterns.