TL;DR
Researchers have identified three types of quasicrystals in the Khatyrka meteorite, and a fourth formed by lightning in Nebraska. These findings confirm natural formation processes, previously thought rare.
Scientists have confirmed the existence of three different naturally occurring quasicrystals in the Khatyrka meteorite, and a fourth formed on Earth through lightning, marking significant advances in understanding their natural origins.
The three quasicrystals found in the Khatyrka meteorite are icosahedrite, decagonite, and i-Phase II, each with unique structural and compositional features. These were discovered in a meteorite that landed in Russia’s Far East and are confirmed to have extraterrestrial origins, formed in ultra-high-velocity asteroid collisions.
Additionally, a fourth quasicrystal, with a dodecagonal symmetry, was found in a fulgurite in Nebraska, created by lightning striking sand. This discovery suggests that high-energy events on Earth can also produce quasicrystals naturally, although the precise formation process remains under investigation.
Why It Matters
This discovery challenges the previous notion that quasicrystals are exceedingly rare in nature, showing they can form in extreme extraterrestrial and terrestrial events. It opens new avenues for research into the formation conditions of these complex structures, which have potential implications for materials science and planetary geology.
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Background
Prior to these findings, only three types of natural quasicrystals had been confirmed, all from extraterrestrial sources, specifically the Khatyrka meteorite, which is unique for containing metallic aluminum and is believed to have formed in a high-velocity asteroid collision. The Nebraska quasicrystal was found in a fulgurite, a rock created by lightning, blurring the line between natural and manmade formations. Most other quasicrystals have been synthesized in laboratories, making these natural occurrences particularly noteworthy.
“The discovery of these natural quasicrystals fundamentally alters our understanding of their formation, showing they are not just laboratory curiosities but can also form in extreme natural events.”
— L. Bindi, lead researcher
“Finding quasicrystals in nature, especially in meteorites and terrestrial lightning strikes, suggests that these structures may be more common in the universe than previously thought.”
— P. J. Steinhardt, materials scientist
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What Remains Unclear
It remains unclear what specific conditions enable the natural formation of quasicrystals on Earth and whether more such instances exist but have yet to be discovered. The exact processes that produce the Nebraska fulgurite quasicrystal are still under investigation, particularly whether lightning or electrical arcs are the primary cause.
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What’s Next
Researchers plan to conduct further explorations of terrestrial environments and meteorite samples to identify additional natural quasicrystals. Laboratory experiments are also underway to replicate the conditions that produce these structures naturally, aiming to better understand their formation mechanisms.
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Key Questions
What are quasicrystals?
Quasicrystals are structures that have an ordered pattern but do not repeat periodically, unlike traditional crystals. They exhibit unique symmetries, such as fivefold or twelvefold, which are forbidden in conventional crystallography.
Why is the discovery of natural quasicrystals important?
It demonstrates that quasicrystals can form naturally in extreme environments, challenging previous assumptions that they are primarily man-made. This has implications for understanding planetary processes and materials science.
How were the quasicrystals in the meteorite formed?
They are believed to have formed during high-velocity collisions between asteroids, creating the extreme conditions necessary for their synthesis, which then preserved them in space and upon landing on Earth.
What is the significance of the Nebraska fulgurite quasicrystal?
It shows that natural high-energy events like lightning strikes can produce quasicrystals on Earth, expanding the known environments where these structures can form.
Are there more natural quasicrystals waiting to be discovered?
Likely yes. Scientists believe that further exploration of meteorites and terrestrial extreme environments could reveal additional natural quasicrystals, offering new insights into their formation conditions.
