fulgurite(redirected from "petrified lightning")
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ful·gu·rite(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.]
(Minerals) a tube of glassy mineral matter found in sand and rock, formed by the action of lightning
[C19: from Latin fulgur lightning]