TL;DR
Researchers have confirmed the discovery of three types of natural quasicrystals in a Russian meteorite and a Nebraska fulgurite. These findings challenge previous assumptions that most quasicrystals are lab-created, highlighting their rare natural occurrence.
Scientists have confirmed the discovery of three different types of naturally occurring quasicrystals in a meteorite from Khatyrka, Russia, and a fulgurite in Nebraska, marking the first verified natural occurrences of these complex structures.
The first natural quasicrystal, icosahedrite, was found in a meteorite that landed in Khatyrka, Russia. It features full three-dimensional icosahedral symmetry and was formed in an ultra-high-velocity asteroid collision. This meteorite is unique as it contains metallic aluminum, a rare element in meteorites.
A second quasicrystal, decagonite, was also discovered in the same meteorite. It exhibits tenfold rotational symmetry in two dimensions and a periodic stacking in the third. Its formation is linked to extraterrestrial high-energy events, and it was characterized through advanced lattice modeling techniques.
The third quasicrystal, identified as i-Phase II, was found in a fulgurite in Nebraska, created when lightning struck sand. Its composition includes aluminum, copper, and iron, with a 12-fold symmetry in atomic planes. Its natural versus man-made origin remains ambiguous, as it could have formed either by lightning or electrical arc from a downed power line.
Why It Matters
This discovery provides concrete evidence that quasicrystals can form naturally, both in extraterrestrial environments and through terrestrial high-energy events. It challenges the previous understanding that all quasicrystals are lab-synthesized, opening new avenues for studying their formation processes and potential applications in materials science.
Understanding natural quasicrystals could influence the study of planetary formation, impact events, and high-energy physics, as well as inspire new synthetic methods for advanced materials with unique properties.
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Background
Prior to this discovery, all known quasicrystals were artificially created in laboratories, with only a few claims of natural formation based on indirect evidence. The first confirmed natural quasicrystal, icosahedrite, was identified in the Khatyrka meteorite in 2012. Subsequent findings included decagonite, also from Khatyrka, and a quasicrystal from a lightning strike in Nebraska, but the latter’s natural origin was uncertain.
The Khatyrka meteorite is highly anomalous, containing metallic aluminum and believed to have formed from an ultra-high-velocity impact in space. The Nebraska fulgurite was formed during a lightning strike, with recent research suggesting electrical discharge as the trigger for quasicrystal formation on Earth’s surface.
“The confirmed presence of these natural quasicrystals reshapes our understanding of mineral formation in extreme environments.”
— Dr. L. Bindi, lead researcher
“The formation of quasicrystals in nature, both in space and on Earth, suggests that these structures are more common than previously thought.”
— Professor P. J. Steinhardt, materials scientist
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What Remains Unclear
It remains unclear how frequently natural quasicrystals form in space and on Earth. The precise conditions leading to their formation, especially in terrestrial environments like lightning strikes, are still under investigation. The natural versus man-made origin of the Nebraska fulgurite quasicrystal is also not definitively settled.
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What’s Next
Researchers plan to search for additional natural quasicrystals in other meteorites and high-energy terrestrial sites. Further studies will aim to understand the formation conditions and potential prevalence of these structures in nature, possibly leading to new synthetic techniques inspired by natural processes.
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Key Questions
What makes these quasicrystals different from regular crystals?
Unlike regular crystals with repeating atomic patterns, quasicrystals have a non-repeating, aperiodic structure that exhibits symmetries forbidden in traditional crystallography, such as fivefold or twelvefold symmetry.
Why is the discovery of natural quasicrystals important?
It challenges the assumption that quasicrystals only form in laboratories, indicating they can form naturally in space and on Earth, which broadens our understanding of mineral formation and high-energy processes.
Could natural quasicrystals have practical applications?
Potentially, yes. Their unique structural properties may lead to novel materials with special electrical, thermal, or mechanical characteristics, although practical uses are still under research.
Are all quasicrystals in nature formed by high-energy events?
Most confirmed natural quasicrystals have been linked to extreme events like asteroid impacts or lightning strikes, but ongoing research aims to determine how common they are and what other natural processes might produce them.
