A piece of Egyptian meteorite glass is forever

In a development that should please AJ to no end, scientists have found a link between the pharoah Tutankhamun and the Tunguska Event (aside from their both starting with T and being impossible to spell):

In 1996 in the Egyptian Museum in Cairo, Italian mineralogist Vincenzo de Michele spotted an unusual yellow-green gem in the middle of one of Tutankhamun's necklaces. The jewel was tested and found to be glass, but intriguingly it is older than the earliest Egyptian civilisation. Working with Egyptian geologist Aly Barakat, they traced its origins to unexplained chunks of glass found scattered in the sand in a remote region of the Sahara Desert. But the glass is itself a scientific enigma. How did it get to be there and who or what made it? ... In 1908, a massive explosion flattened 80 million trees in Tunguska, Siberia. Although there was no sign of a meteorite impact, scientists now think an extraterrestrial object of some kind must have exploded above Tunguska. [One geophysicist] wondered if a similar aerial burst could have produced enough heat to turn the ground to glass in the Egyptian desert.

Read on for the next clue in the mystery...