igneous
Tektite (Indochinite)
Tektite (High-silica natural glass)
Hardness: 5.5 - 6.5 Mohs; Color: Black, dark green, or brownish-black; Luster: Vitreous to dull; Crystal structure: Amorphous (glassy); Cleavage: None (conchoidal fracture); Specific gravity: 2.3 - 2.5
- Hardness
- 5
- Color
- Black, dark green, or brownish-black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 5.5 - 6.5 Mohs; Color: Black, dark green, or brownish-black; Luster: Vitreous to dull; Crystal structure: Amorphous (glassy); 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 back to Earth. Most Indochinites are approximately 700,000 to 800,000 years old.
Uses & applications
Primarily used for gemstone collecting, jewelry (often wire-wrapped or carved), and by those interested in metaphysical/lapidary properties.
Geological facts
Tektites contain almost no water, making them much drier than volcanic glass (obsidian). The Indochinite strewn field is the largest on Earth, covering much of Southeast Asia and Australia.
Field identification & locations
Identify by its pitted, 'leathery' or 'regmaglypted' surface texture and translucency when held to a strong light (thin edges may appear yellowish-brown). Commonly found throughout Thailand, Laos, and Vietnam.
