 | Tektites are natural glass formed from terrestrial debris ejected into Earth's atmosphere during meteorite impacts.
LDG is almost pure silicon-dioxide, like quartz, but its crystal structure is different. It also contains in traces an unusual combination of elements, like iron, nickel, chromium, cobalt and iridium. | It's thought LDG formed 28 to 26 million years ago when an impact melted the quartz-rich sands of the desert. |