BBC Focus Magazine

[M Paul Lloyd]

Examples of a crystal previously thought to be impossible in nature may have come from space, a study shows.
Quasicrystals have an unusual structure - in between those of crystals and glasses.
Until two years ago, quasicrystals 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 arrived in meteorites.
Quasicrystals were first described in the 1980s by Israeli researcher Daniel Schechtman, who was awarded last year's Nobel Prize in Chemistry for the discovery.

More here
http://www.bbc.co.uk/news/science-environment-16393296

[Nails]

They're not really impossible if they can be created in the lab........

[M Paul Lloyd]

Ah they covered themselves there by refering to them as being 'impossible in nature' .