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" ... A fulgurite is formed at much higher temperatures than any lava, about 30,000 degrees Celsius, hot enough to vaporize any residual internal moisture. To test this hypothesis, Jonathan Castro, a volcanologist at the Johannes Gutenberg University of Mainz, and his team created artificial fulgurites by zapping rock samples with an arc welder, raising temperatures to the tool's maximal capacity of 10,000 degrees. ... "
" ... Several of that study’s experiments led to a rather curious discovery: the volume of the fulgurite is linearly proportional, give or take, to the total energy emitted by the electron beam. This suggests that, using fulgurites in nature, we could work backwards and find out how energetic those ephemeral beams of lightning originally were. ... "