OK, they don't actually have glassy insides...
but ... then i still want to find out more...?
i want to see a real certified Fulgurite bead that shows the glassiness, and i also want to find out what my beads are and where they originated from- with their sandy yellow colour and strung on raffia in the african way-

i think i remember getting them in the tribal jewellery fair in Amsterdam a few years ago...