Fulgurite
METAMORPHIC ROCK FORMED WHEN LIGHTNING STRIKES SAND, SOIL, SAND, ROCK, ORGANIC DEBRIS
Fulgurites; Fulgarite; Fulgerite; Fossil lightning; Petrified lightning; Fulqurites; Fulgerites
An irregular and tubular mass of vitrified quartz, believed to be formed
by melting under the lightning stroke.
Fig. 175. CRUCIBLE, ELECTRIC.