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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