Tektite (Indochinite)

Physical Properties

Hardness: 5.5-6.5 (Mohs); Color: Black (translucent brown on thin edges); Luster: Vitreous to dull; Crystal structure: Amorphous; Cleavage: None (conchoidal fracture); Specific gravity: 2.3-2.5

Formation & Geological History

Formed from terrestrial debris ejected into the atmosphere during a meteorite impact, which cooled rapidly into glass as it fell back to Earth. Indochinites are associated with the Australasian strewn field, approximately 790,000 years old.

Uses & Applications

Used primarily by collectors and in metaphysical jewelry (pendants, wire-wrapped pieces). Rarely used in industrial glass production.

Geological Facts

Tektites contain almost no water (averaging 0.005%), which is much lower than volcanic glasses like obsidian. They are often pitted with 'regmaglypts' resembling thumbprints caused by atmospheric ablation.

Field Identification & Locations

Identify by its pitted, bubbled, or 'splash-form' surface and lack of crystals. Found across Southeast Asia (Vietnam, Thailand, Cambodia). Collectors should look for signs of aerodynamic shaping.

Identified on: 4/20/2026

Mode: Standard