Tektite
Impactite var. Tektite · Meteoritic Material / Impact-derived Glass
Crystal System
Amorphous (Non-crystalline glass)
Mineral Group
Silicates (Natural Glass / Impactite)
Chemical Formula
SiO2 with varying amounts of Al2O3, FeO, MgO, CaO, Na2O, K2O, and TiO2 (Silicate glass)
Formation Process
Impact melting of terrestrial rocks during high-velocity hypervelocity meteorite impacts, followed by rapid cooling in flight and deposition
About This Crystal
Small, dark, rounded glassy specimen with a smooth yet pitted or sculpted surface texture. Exhibits a deep black color, sub-conchoidal to conchoidal fracture, and glassy luster typical of impact glasses.
Physical Characteristics
Color is deep black to dark brown with a white streak. Cleavage is none due to amorphous structure. Fracture is conchoidal. Specific gravity ranges from 2.3 to 3.0. Tenacity is brittle. Non-magnetic and non-fluorescent.
Optical Properties
Isotropic (singly refractive) due to amorphous glass structure. Refractive index ranges from approximately 1.48 to 1.52. No pleochroism or birefringence.
Hardness & Durability
Origin Region
Found globally in specific strewn fields such as Australasia, Central Europe (Moldavite), North America, and the Ivory Coast; formed by meteorite impacts on Earth's surface
Hardness & Durability
Mohs hardness of 5.5 to 6.5. Moderate toughness, but vulnerable to chipping if dropped. Stable under normal conditions, susceptible to hydrofluoric acid.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid harsh chemicals, ultrasonic cleaners, and abrasive materials. Store separately to prevent scratching.
Rarity & Value
Uncommon to Rare depending on the specific strewn field and type. Value depends on size, shape, surface sculpting, and origin. Common tektites are moderately priced, while rare varieties like Moldavite command higher collector values.
Special Characteristics
Composed of natural silica glass containing characteristic lechatelierite inclusions, gas bubbles, and flow lines formed during extreme thermal events of meteorite impacts.
Lore & History
Historically associated with cosmic origins, shooting stars, and protection talismans. Used in modern crystal healing to promote high vibrational frequency, spiritual evolution, and grounding cosmic energy, though these are traditional beliefs.