igneous
Tektite (Indochinite)
Tektite (SiO2 + Al2O3, Glassy Melts)
Hardness: 5.5-6.5; Color: Black, dark brown (translucent on thin edges); Luster: Vitreous to dull; Crystal structure: Amorphous (non-crystalline glass); Specific Gravity: 2.3-2.5
- Hardness
- 5
- Color
- Black, dark brown (translucent on thin edges)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 5.5-6.5; Color: Black, dark brown (translucent on thin edges); Luster: Vitreous to dull; Crystal structure: Amorphous (non-crystalline glass); Specific Gravity: 2.3-2.5
Formation & geological history
Formed by the 790,000-year-old Indochinese meteorite impact event. They are terrestrial debris ejected into the atmosphere, melted by the kinetic energy, and solidified during re-entry.
Uses & applications
Primarily used for collector specimens, metaphysical jewelry, and as raw materials for faceted gemstones.
Geological facts
Tektites contain almost no water—about 0.005%, which is significantly less than terrestrial volcanic glass like obsidian. The 'Indochinite' strewn field is the largest on Earth.
Field identification & locations
Look for a pitted, 'dimpled' surface (lechatelierite inclusions) and a lack of magnetic pull. Commonly found in Southeast Asia, particularly Thailand, Vietnam, and Cambodia.
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