Lab discovers first pentagonal ice crystals by chance

They say that no two snowflakes are the same, but like all natural ice crystals they are only variations on the same six-sided theme. Now physicists have found the first evidence of pentagonal ice crystals.
The unusual rod-like ice crystals were formed on a copper surface in an ultrahigh vacuum at temperatures of -173 °C. Under those conditions, a tiny quantity of water begins to adsorb onto the copper, spontaneously forming into freestanding rods.

Full article on NewScientist



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