Why some minerals form as seemingly perfect cubes?

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While visiting Harvard’s natural history museum on a trip to Boston, i’ve seen some minerals (or crystals. Not exactly sure of the difference between them) that seems to have naturally formed into near perfect cubes. How is that possible?
It seemed to be most frequent in pyrite.

Thanks in advance!

(Tagged as chemistry, but not sure if it fits)

In: Chemistry

4 Answers

Anonymous 0 Comments

Not a mineral expert, but I thought in those cases the iconic bonds were naturally at 90°, similar to how bonds between atoms in a water molecule are 104.5°, leading to its tetrahedrol shape. Physicists?

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