The origin of Fulgurite found mainly on sandy beaches by silicon melting induced by the ball lightning nucleus of the front of a lightning stroke. (below)
Fulgurites according to Quantum FFF Theory, are assumed to be the result of the splitting decaying "new physics" Ball Lightning being the smallest form of an "electric dark matter black hole" or rigid string based quantum knots.
see: for the relation between ball lightning and new physics black holes: Blue Jets, Sprites and Elves above thunderclouds or interference micro black holes.
https://bigbang-entanglement.blogspot.com/2021/01/blue-jets-sprites-and-elves-above.html
and: Fulgurite created by Lightning bullet also known as ball lightning, according to Quantum FFF theory.
https://vixra.org/pdf/1805.0307v1.pdf
also: https://bigbang-entanglement.blogspot.com/2017/09/photonic-molecules-or-ball-lightning.html
See also: ENERGY OUT OF T4HE VACUUM BY TWO CHARGED FERMUION CREATING BHs. ( ARTIFICIAL INDUCED BALL LIGHTNINGS)