Libyan Desert Glass Impactite Individual, 353.18g, Translucent Yellow-Green Silica Glass

Translucent silica glass from ancient impact event

This 353.18g specimen displays the characteristic translucent yellow-green coloration of Libyan Desert Glass, with visible flow textures frozen in place from the moment of formation. The natural surface retains the sculptural forms created by aerodynamic ablation and sandblasting in the Great Sand Sea. Light passes through portions of the glass, revealing internal structures and occasional inclusions captured during the impact melt process.

The specimen's substantial mass provides exceptional display presence while maintaining the delicate transparency that makes this material visually distinctive. Surface features include natural pitting, flow lines, and the matte texture characteristic of prolonged desert weathering.

Formation and composition

Libyan Desert Glass forms from pure silica sand subjected to extreme temperatures exceeding 1,700°C during meteorite impact. The resulting material is lechatelierite, a naturally occurring silica glass that requires temperatures far beyond what volcanic processes can achieve. The impact event 29 million years ago in the Late Oligocene melted desert sand instantaneously, creating scattered glass fragments across approximately 6,500 square kilometers of the Great Sand Sea.

The yellow-green coloration results from trace iron content in the original sand, while the translucent to transparent clarity indicates minimal contamination during the melt phase. Flow textures visible in this specimen record the turbulent conditions during formation, when molten silica cooled rapidly in the air following ejection from the impact site.

Scientific context

Libyan Desert Glass represents one of Earth's largest and oldest impact glass strewn fields. The source crater remains unidentified despite extensive survey work, though candidates include the partially buried Kebira crater structure. The glass composition closely matches local Nubian sandstone, confirming a terrestrial rather than extraterrestrial origin for the source material. Impact glass formations provide direct evidence of cosmic collision events and the extreme conditions they generate. For more information about impact materials and their formation, see Learn About Meteorites.

Ancient Egyptians recognized the material's value, incorporating carved pieces into jewelry and ceremonial objects. A scarab carved from Libyan Desert Glass appears in the pectoral ornament discovered in Tutankhamun's burial chamber, demonstrating that this material held significance more than 3,300 years ago.

Frequently asked questions

Is this authentic Libyan Desert Glass? Yes. This specimen was collected from the Great Sand Sea strewn field in Libya in 2024. Each piece includes a certificate of authenticity documenting its provenance from the established impact glass field.

What is lechatelierite? Lechatelierite is pure silica glass formed at temperatures above 1,700°C. Natural occurrence requires either meteorite impact or lightning strike conditions. Libyan Desert Glass consists primarily of this high-temperature silica glass phase, distinguishing it from volcanic glasses like obsidian which form at lower temperatures and contain additional minerals.

What is included with this specimen? You receive the 353.18g Libyan Desert Glass specimen and certificate of authenticity. No display stand is included.

How old is Libyan Desert Glass? Radiometric dating places the formation event at approximately 29 million years ago during the Late Oligocene epoch. The glass has remained scattered across the desert surface since that time, subjected to weathering and wind transport.

Can light pass through the specimen? Yes. Libyan Desert Glass ranges from translucent to transparent depending on thickness and inclusion content. This specimen allows light transmission through thinner sections, revealing internal flow structures and color gradations.

Display and collection value

Impact glasses represent direct physical evidence of cosmic collisions, making them scientifically significant additions to meteorite collections. This specimen's substantial weight and translucent quality make it suitable for backlit display, where transmitted light emphasizes the internal structure and coloration. The natural surface textures and flow patterns provide visual interest from multiple viewing angles.

Collectors value Libyan Desert Glass for its combination of geological rarity, ancient Egyptian historical connection, and distinctive appearance. The material's formation mechanism links it directly to meteorite impact processes, complementing collections focused on extraterrestrial materials and impact phenomena. Browse additional impact-related specimens in our Tektites & Impactites collection.