单词：fulgurite
音标：['fʌlgjurait] ；
n. 闪电熔石, 闪电岩, 闪熔矿管
n. A vitrified sand tube produced by the striking of
lightning on sand; a lightning tube; also, the portion of rock surface
fused by a lightning discharge.
lightning on sand; a lightning tube; also, the portion of rock surface
fused by a lightning discharge.