Mystery #1Tier 2chemistry / solids
Why do crystals have such perfect flat faces and sharp edges?
A salt grain under a magnifier, a quartz point, a sugar crystal: they all have weirdly perfect flat faces and crisp straight edges, like tiny gems someone cut by hand. But nobody carved them. So how does a lump of plain matter end up with such neat, machine-perfect shapes all on its own?
Your guess
What's your hunch about what gives a crystal its flat faces and sharp edges?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
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