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Lonsdaleite is formed within meteorites and found when the meteorites land on earth. This is another alltrope of carbon, but with a different -- Hexagonal dihexagonal dipyramidal -- crystal structure.

It is always softer than a diamond, because a diamond's crystal structure maximizes the carbon's valance -- four -- into its rigid tetrahedral network of covalent bonds on eight sides.

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10y ago

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Lonsdaleite is softer than diamond when impacted at certain angles. Its structure makes it more susceptible to cleavage compared to diamond, leading to potentially lower scratch resistance and hardness under specific conditions.

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10mo ago
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Q: When is lonsdaleite softer than a diamond?
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