mineral

Tektite

Tektite (Natural Glassy Ejecta)

Hardness: 5.5-6.5 on Mohs scale; Color: Black, dark green, or brownish; Luster: Vitreous to dull; Crystal Structure: Amorphous (glassy); Cleavage: Conchoidal fracture; Specific Gravity: 2.3-2.5

Hardness: 5
Color: Black, dark green, or brownish
Luster: Vitreous to dull

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5 on Mohs scale; Color: Black, dark green, or brownish; 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 meteorite impacts. The debris melts and cools rapidly into glass as it falls back to Earth. Ages vary by strewn field, ranging from 790,000 to 35 million years old.

Uses & applications

Primarily used by collectors, in metaphysical jewelry, and for scientific research into impact events. Historically used as tools by prehistoric humans.

Geological facts

The name comes from the Greek word 'tektos' meaning molten. They are some of the driest minerals on Earth, containing almost no water. Common varieties include Moldavite (green) and Indochinite (black).

Field identification & locations

Identify by its pitted, sculpted surface (regmaglypts) and glassy interior when chipped. Often found in specific geographical 'strewn fields' such as Southeast Asia, Australia, and Central Europe.