fulgurite


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fulgurite

[′fu̇l·gə‚rīt]
(geology)
A glassy, rootlike tube formed when a lightning stroke terminates in dry sandy soil; the intense heating of the current passing down into the soil along an irregular path fuses the sand.
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Matthew Pasek and Kristin Block of the University of Arizona, Tucson, used an MRI scanner on 10 fulgurites and found that five contained phosphite.
It is not clear if the fulgurite was formed on the mountain or elsewhere.
The tests, which are the first to look at the chemical composition of a fulgurite's gas bubbles, revealed a small amount of argon, the atmosphere's most abundant inert gas today.
McCollum proposes that such split-second events persist in the world only through tangential documentation and chance residue, what he calls "literature." Thus, the first thing one saw on entering the gallery was not the fulgurites themselves but a shelf of "Supplemental Didactics": sixty-six paper booklets, identically bound in drab tan.
While it seemed a long shot, the team hit pay dirt after sampling glassy lightning-seared rocks - known as fulgurites - from just five locations.
But Essene and Fisher's study of the Winans Lake fulgurite, published in the Oct.
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.