mineral

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium

AI-generated identification · may be incorrect

Dark brown to nearly black, translucent at thin edges, vitreous luster, conchoidal fracture, no cleavage, and typically Mohs 5.5–6.5; irregular splash-like shape and surface pitting are common.

Identified August 10, 2026More mineral →

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Physical properties

Dark brown to nearly black, translucent at thin edges, vitreous luster, conchoidal fracture, no cleavage, and typically Mohs 5.5–6.5; irregular splash-like shape and surface pitting are common.

Formation & geological history

Formed when a large meteorite impact melted and ejected terrestrial rocks, which cooled rapidly into glass. The specimen’s appearance is consistent with Southeast Asian tektites, generally about 0.7–0.8 million years old from the Australasian impact event.

Uses & applications

Primarily collected as an impactite; attractive pieces are used in pendants and cabochons, though they are less valuable than transparent gemstones.

Geological facts

Tektites are not meteorites: they are melted Earth material produced by impacts. Their chemistry commonly resembles local crustal rocks rather than extraterrestrial material.

Field identification & locations

Look for lightweight, naturally pitted or sculpted forms, glassy fracture, and uniform dark coloration; avoid confusing them with industrial glass or slag. Common varieties occur in Thailand, Vietnam, Cambodia, Laos, southern China, the Philippines, and Australia.