[smug -e] I have a fulgurite - found it in a sand dune during a First Year geology excursion at Long Reef, one of Sydney's northern beaches.

It isn't glassy, the exterior being quite granular. The grains lining the tube seem welded together.

I originally thought that it may be a fossil crab burrow, but numerous people have since concurred that it's a fulgurite.

stales