Lightning

[Mike I.]

Saw a "fulgurite" specimen recently - this is a branching tube of fused 
glass formed when lightning strikes sandy ground. The fellow that found 
it had pieces about 8 cm in diameter, several 10's of cm's in 
length. Black on the outside, and filled with green colored frothy glass 
on the inside. He apparently found one piece that is about 1.3 metres in 
length. These are quite solid and dense. Lots of energy to form these! 
Mike