Beudant  succeeded in making tubes, in most respects similar to these fulgurites
, by passing very strong shocks of galvanism through finely-powdered glass: when salt was added, so as to increase its fusibility, the tubes were larger in every dimension, They failed both with powdered felspar and quartz.
The scientists sampled the rock, from southern France, and found that the layer underneath the fulgurite
had parallel stripes, which tipped them off to the shock lamellae.
is a glass mineral formed by the action of what?
Measurement of the prearcing time and the fulgurite
length in HBC fuse in the case of tests performed with an A.C.
When lightning strikes sand or sediment, the path followed by the bolt can fuse into a glassy tube called a fulgurite
When lightning struck, people went to look for something special and no doubt they found something, even if it was just a regular but a really smooth stone or a fossilized trilobite or maybe a real fulgurite
. At this point I cannot go more deeply into the intriguing problem, and have to ask at which point these Stone Age artefacts were regarded as thunderstones.
The melted ground then hardens into a glassy rock called fulgurite
It was found near a sample of glass-like fulgurite
, otherwise known as petrified lightning, which is formed when lightning strikes sandy soil.
Studying samples of a fulgurite
that had been collected in 1999, Navarro-Gonzalez and his colleagues found that it had formed 15,000 years ago.
The art object in this case was not a painting or sculpture but a fulgurite
, a tubular specimen of petrified lightning.
So far, the Sheep Mountain fulgurite
and the shungite - a coal-like sedimentary material - appear to have very different histories.
But what Fisher and petrologist Eric Essene found instead was the world's largest known fulgurite
-- a tube-shaped glob of glass that had formed when lightning struck the ground.