Does nature ever produce a perfect square?

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answers:
Paula say: diamonds and other crystals are square
https://en.wikipedia.org/wiki/Diamond

and there are some perfectly square diamonds
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say: a salt crystal.
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say: I'm sure there's one out there somewhere. Have you ever seen the guy that does all kinds of tricks and shapes with bubbles? He can make a square bubble. Seeing how he does it, I could that imagining in nature any time a bunch of bubbles are crowded together.
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