igneous
Tektite (Indochinite)
Tektite (Natural silica glass)
Hardness: 6-7 Mohs; Color: Black to dark brown; Luster: Vitreous to dull; Crystal structure: Amorphous (glassy); Cleavage: None (conchoidal fracture); Specific gravity: 2.3-2.5
- Hardness
- 6-7 Mohs
- Color
- Black to dark brown
- Luster
- Vitreous to dull
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: Black to dark brown; 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 during a hypervelocity meteorite impact. This specimen likely belongs to the Australasian strewn field, formed approximately 790,000 years ago.
Uses & applications
Predominantly used for gemstone collecting, jewelry (faceting or cabochons), and in spiritual/metaphysical practices.
Geological facts
Tektites are unique because they are composed of earth material that was melted, launched into the upper atmosphere, and then flash-cooled as it fell back to Earth. They contain almost no water, unlike volcanic glass (obsidian).
Field identification & locations
Identify in the field by looking for pitted 'skin' (lechatelierite bubbles), aerodynamic shapes like teardrops or buttons, and a dark, non-crystalline appearance. Commonly found in South East Asia (Indochinites) and Australia.
