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.
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.
Even before people learned how to make glass, they had discovered two forms of natural glass: fulgurites
Matthew Pasek and Kristin Block of the University of Arizona, Tucson, used an MRI scanner on 10 fulgurites
and found that five contained phosphite.
2] levels that are 2,500 times higher in 5,000-year-old fulgurites
than in modern samples, scientists have speculated that the extra C[O.
Then it hardens into lumps of glass called fulgurites
, 2003, another work by Steve Roden, modeled in miniature this aspect of the exhibition.
60] has since been reported in meteorites, in soot at the K/T boundary, in carbonaceous tuff from Sudbury's Onaping Formation impact breccia, in fulgurites
, and in sediments at the Permian/Triassic boundary.
An hour earlier, while running for the car, it had occurred to me the at the scrub might be the perfect place to hunt for fulgurites
, those little tubes of fused sand formed by lightning when it hits the ground.
However, the lumps and tubes of glass that litter the region's shifting dunes are proof that lightning, the only source of fulgurites
, frequently touched down there in the past.
Thus, the first thing one saw on entering the gallery was not the fulgurites
themselves but a shelf of "Supplemental Didactics": sixty-six paper booklets, identically bound in drab tan.