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.
is a glass mineral formed by the action of what?
They form as a gas from burning candles and exist as solids in certain types of rock, such as the mineral shungite found in Russia, and fulgurite
, a glassy rock from Colorado that forms when lightning strikes the ground.
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
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.
Using mass spectroscopy to analyze a fulgurite
from Sheep Mountain in southern Colorado, they detected the 60- carbon spherical buckyball and its larger, 70-carbon cousin.
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.
It has been suggested to me that the 'diamond' may be a reference to the geological phenomenon of fulgurites
, known in Bislama as tut blotig tancla (Kirk Huffman, pers.
From this discharge of atmospheric electricity, a leader of a bolt of lightning can travel at speeds of 220,000 km/h (140,000 mph), and can reach temperatures approaching 30,000 [degrees]C (54,000 [degrees]F), hot enough to fuse silica sand into glass channels known as fulgurites
which are normally hollow and can extend some distance into the ground.