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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.
Hess also studies fulgurites, which are vitreous, glassy materials formed through the fusion of sand or rock by lightning strikes.
Which natural phenomenon is responsible for the creation of fulgurites? 5.
(3.) It has been suggested to me that the 'diamond' may be a reference to the geological phenomenon of fulgurites, known in Bislama as tut blotig tancla (Kirk Huffman, pers.
Slender glass tubers called 'fulgurites,' formed through the heat of lightning strikes that fused the sands, may still be found on beaches that have been struck.
From this discharge of atmospheric electricity, a leader of a bolt of lightning can travel at speeds of 220,000 km/h (140,000 mph), and can reach temperatures approaching 30,000 [degrees]C (54,000 [degrees]F), hot enough to fuse silica sand into glass channels known as fulgurites which are normally hollow and can extend some distance into the ground.
Even before people learned how to make glass, they had discovered two forms of natural glass: fulgurites and obsidian.
Matthew Pasek and Kristin Block of the University of Arizona, Tucson, used an MRI scanner on 10 fulgurites and found that five contained phosphite.
Finding C[O.sub.2] levels that are 2,500 times higher in 5,000-year-old fulgurites than in modern samples, scientists have speculated that the extra C[O.sub.2] resulted from vaporization of organic material by lightning ("Stroke of Good Fortune: A wealth of data from petrified lightning," SN: 2/17/07, p.
Then it hardens into lumps of glass called fulgurites. (Fulgur is the Latin word for lightning.)
Fulgurites, 2003, another work by Steve Roden, modeled in miniature this aspect of the exhibition.
Ernest Harms exhibited an exciting working model showing how lightning strikes sand and fuses it to create fulgurites. His exhibit of fulgurites, including one he had dug which measured six feet in length, rounded out that display.