Examples of crystals before thought to be impossible in nature may have come from space, a study shows.
Quasi-crystals have an unusual structure in between those of crystals and glasses.
Until before two years, quasi-crystals had only been created in the lab, then geologists found them in rocks from Russia's Koryak mountains.
In PNAS journal, a team says the chemistry of the Russian crystals suggests they inwards in meteorites.
Quasi-crystals were first described in the 1980s by
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