Libyan Desert Glass rockinaboxlabrea This period is considered the

This period is considered the sunset of chain mail in Europe

the Space Shuttle Challenger was the second of the space shuttles in the program to enter orbit

This amazing ability helps them determine the precise locations of their target before they strike

Colors and patterns will vary widely

This specimen is a fragment of North Pole Dome Stromatolite from Dresser Formation in Western Australia

Libyan Desert Glass rockinaboxlabrea This period is considered theComet impact glass! 28,500,000 years old! Above: Front of the Specimen Card. In the southeastern spur of North Africas Great Sand Sea, there are several fields of luminous, yellow green glass known as Libyan Desert Glass (LDG). Due to the lack of any visible impact crater, the most likely source is a low density asteroid or comet airburst explosion leading to the fusion of silica rich sands roughly 28,500,000 years ago.