fulgurite

(ful′gyo̵o rīt′)

noun

a glassy substance, usually tube-shaped, formed by fusion when sand, rock, etc. are struck by lightning

Origin: L fulgur (see fulgurate) + -ite

See fulgurite in American Heritage Dictionary 4

noun

A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.

Origin:

Origin: Latin fulgur, lightning; see fulgurate

Origin: + -ite¹

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