Fulgurite definitions

fo͝ol'gyə-rīt', -gə-, fŭl'-
A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.
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A glassy substance, usually tube-shaped, formed by fusion when sand, rock, etc. are struck by lightning.
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A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.
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Glass formed by a lightning strike melting sand or other material.
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Origin of fulgurite

Latin fulgur lightning fulgurate –ite