Fulgurite: The evidence for decaying Ball Lightning string nucleus into sandy ground.

The are million examples found at sandy beaches of Fulgurite tubesmade of burned molten sand.
Fulgurites are officialy connected to Lightning strikes into the beach.

In Q-FFF Theory, hot Ball Lightnings sometimes create lightning channels and strokes.

Suggestion:  Fulgurute is originated by splitting and decaying micro blackhole based Ball lightning nuclei.  see: 

"Fulgurite created by Lightning bullet also known as ball lightning, according to Quantum FFF theory."

https://vixra.org/pdf/1805.0307v1.pdf

Q-FFF Theory has connections to the electric universe: https://www.youtube.com/watch?v=G2RTb4uvWyo