Libyan glass or gold Tektite
Libyan desert glass or 'gold Tektite is a Tektite found in the desert on the border of Egypt and Libya.
Large meteorite impact
The Tektite is about 28 million years ago by a very large meteorite impact. It so much energy and heat was quite the desert sand was melted into glass.
Libyan glass is conspicuous by its yellow color but can have the different layers of sand too brown. It is the only Tektite on earth with this striking yellow color and was therefore named 'golden tektite'
At the time of the Pharaohs was the Tektite already known and it was seen as a valuable gemstone.