Impactite includes shock-metamorphosed target rocks, melts (suevites) and mixtures of the two, as well as sedimentary rocks with significant impact-derived components (shocked mineral grains, tektites, anomalous geochemical signatures, etc.). In June 2015, NASA reported that impact glass has been detected on the planet Mars—such material may contain preserved signs of ancient life—if life existed.
When a meteor strikes a planet's surface, the energy release from the impact can melt rock and soil into a liquid. If the liquid cools and hardens quickly into a solid, impact glass forms before the atoms have time to arrange into a crystal lattice. Impact glass is dark brown, almost black, and partly transparent.
Known examples of impactite
- Alamo bolide impact (Late Devonian) of Nevada
- Alga crater on the planet Mars
- Charlevoix crater of Québec
- Darwin Crater from Tasmania (source of Darwin glass)
- Lake Lappajärvi, Finland (source of Kärnäite)
- Manicouagan crater of Québec
- Neugrund crater of Estonia
- Nördlinger Ries crater, Germany
- Rochechouart crater, France
- Wabar craters, Saudi Arabia
|Wikimedia Commons has media related to Impactite.|
- "1994LPI....25.1347S Page 1347". adsabs.harvard.edu. Retrieved 2017-07-04.
- Staff (8 June 2015). "PIA19673: Spectral Signals Indicating Impact Glass on Mars". NASA. Retrieved 8 June 2015.
- Temming, Maria. "Exotic Glass Could Help Unravel Mysteries of Mars". Retrieved 2015-06-15.
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