mineraloid / impact glass
Tektite (Indochinite)
Tektite (High-silica natural glass)
Hardness: 5.5-6.5 on Mohs scale; Color: Black, dark brown (usually translucent on thin edges); Luster: Vitreous to dull; Crystal structure: Amorphous (glassy); Cleavage: Conchoidal fracture; Specific gravity: 2.3-2.5
- Hardness
- 5
- Color
- Black, dark brown (usually translucent on thin edges)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 5.5-6.5 on Mohs scale; Color: Black, dark brown (usually translucent on thin edges); Luster: Vitreous to dull; Crystal structure: Amorphous (glassy); Cleavage: 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 back to Earth. Indochinites are associated with the Australasian strewn field, formed approximately 780,000 years ago.
Uses & applications
Primarily used for gemstone jewelry (faceted or cabochon), metaphysical collecting, and scientific research into meteorite impact events.
Geological facts
Tektites contain almost no water, unlike volcanic glass (obsidian). The pitted surface is caused by aerodynamic ablation as the molten material re-entered the atmosphere at high speeds.
Field identification & locations
Identify by its pitted, scalloped surface (regmaglypts), lack of crystals, and dark black color that may appear olive green or brown when held to a strong light. Found mostly in Southeast Asia (Thailand, Vietnam, Cambodia).
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