fulgurite

[fuhl-gyuh-rahyt]
noun
a tubelike formation in sand or rock, caused by lightning.

Origin:
1825–35; < Latin fulgur (see fulgurate) + -ite1

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Collins
World English Dictionary
fulgurite (ˈfʌlɡjʊˌraɪt)
 
n
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 & Unabridged 10th Edition
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American Heritage
Science Dictionary
fulgurite   (fl'gyə-rīt', -gə-)  Pronunciation Key 
A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

fulgurite

a glassy silica mineral (lechatelierite or amorphous SiO2) fused in the heat from a lightning strike. Fulgurite is a common mineral with two varieties. Sand fulgurites, the more common, are branching, more or less cylindrical tubes that are about one centimetre (one-half inch) to several centimetres in diameter; they are commonly less than 3 metres (10 feet) long but sometimes reach 20 m (66 ft). The central cavity is usually lined with glass, and the exterior shows adhering sand grains. The shores of Lake Michigan and the Atlantic coast are typical sites

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Known as a fulgurite, this type of rock structure is formed when lightning strikes the ground.
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