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fulgurite

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
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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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 Voyage of the Beagle by Darwin, Charles View in context
 
 
 
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