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 (fo͝ol′gyə-rīt′, -gə-, fŭl′-)
A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.

[Latin fulgur, lightning; see fulgurate + -ite.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) a tube of glassy mineral matter found in sand and rock, formed by the action of lightning
[C19: from Latin fulgur lightning]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
Beudant [11] succeeded in making tubes, in most respects similar to these fulgurites, by passing very strong shocks of galvanism through finely-powdered glass: when salt was added, so as to increase its fusibility, the tubes were larger in every dimension, They failed both with powdered felspar and quartz.
The scientists sampled the rock, from southern France, and found that the layer underneath the fulgurite had parallel stripes, which tipped them off to the shock lamellae.
Fulgurite is a glass mineral formed by the action of what?
Measurement of the prearcing time and the fulgurite length in HBC fuse in the case of tests performed with an A.C.
When lightning strikes sand or sediment, the path followed by the bolt can fuse into a glassy tube called a fulgurite.
When lightning struck, people went to look for something special and no doubt they found something, even if it was just a regular but a really smooth stone or a fossilized trilobite or maybe a real fulgurite. At this point I cannot go more deeply into the intriguing problem, and have to ask at which point these Stone Age artefacts were regarded as thunderstones.
The melted ground then hardens into a glassy rock called fulgurite.
It was found near a sample of glass-like fulgurite, otherwise known as petrified lightning, which is formed when lightning strikes sandy soil.
Studying samples of a fulgurite that had been collected in 1999, Navarro-Gonzalez and his colleagues found that it had formed 15,000 years ago.
The art object in this case was not a painting or sculpture but a fulgurite, a tubular specimen of petrified lightning.
So far, the Sheep Mountain fulgurite and the shungite - a coal-like sedimentary material - appear to have very different histories.
But what Fisher and petrologist Eric Essene found instead was the world's largest known fulgurite -- a tube-shaped glob of glass that had formed when lightning struck the ground.