igneous
Tektite (Indochinite)
Tektite (Amorphous silica-rich impact glass)
Hardness: 5.5-6.5 (Mohs scale); Color: Black (translucent brown on thin edges); Luster: Vitreous to dull; Structure: Amorphous (non-crystalline glass); Specific Gravity: 2.3-2.5
- Hardness
- 5
- Color
- Black (translucent brown on thin edges)
- Luster
- Vitreous to dull
Identified More igneous →
Explore Tektite (Indochinite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5.5-6.5 (Mohs scale); Color: Black (translucent brown on thin edges); Luster: Vitreous to dull; Structure: Amorphous (non-crystalline glass); Specific Gravity: 2.3-2.5
Formation & geological history
Formed from terrestrial debris ejected into the atmosphere during a meteorite impact, which cooled rapidly while falling back to Earth. This specific Indo-Australian strewn field event occurred approximately 790,000 years ago.
Uses & applications
Used primarily by gemstone collectors, in jewelry as beads or pendants, and in some metaphysical practices. Historically used for making tools by ancient cultures.
Geological facts
Tektites contain almost no water (averaging 0.005%), which distinguishes them from volcanic obsidian. The pitted surface features, called 'sculpturing,' are caused by chemical etching or aerodynamic stresses during atmospheric reentry.
Field identification & locations
Identify in the field by its distinctive pitted 'skin,' aerodynamic shape, and lack of internal crystals. Commonly found in Southeast Asia, Australia, and parts of China within the Australasian strewn field.
