Atacamaite - Tektoids

Atacamaites are rare glassy impactites from the Atacama Desert of Chile, often described as tektite-like or ‘tektoid’ materials. They are associated with a Miocene impact glass strewn field in the Central Depression of the Atacama Desert, covering around 650 square kilometers. These small splash-form glasses are thought to have formed during a high-energy impact event involving an iron meteoroid, which melted local rocks and produced glassy ejecta close to the source area.

Atacamaites are typically small, dark glassy objects, usually black to very dark brown, with irregular splash-form shapes. Their surfaces may show flow textures, twisting, pitting, vesicles, and other features created as molten material cooled rapidly. Research describes the main glass as dacitic in composition, formed by high-temperature melting of local magmatic rocks with variable contamination from an iron meteorite impactor. This sets Atacamaites apart from both volcanic glass and classic distal Tektites.

Studying Atacamaites provides valuable insight into proximal impact glass formation, impact melting, and the interaction between metallic impactors and terrestrial surface rocks. Their limited occurrence and distinct composition make them a specialised category within impact-related materials. For collectors, Atacamaites offer an unusual and increasingly recognised addition to Tektite, Impactite, and meteorite-related collections, representing a rare form of natural glass shaped by cosmic impact processes.