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Yale-Led Team Solves Half-Century Carbon-Crystal Mystery 42

slew writes "Unlike its more famous carbon cousins: diamonds and fullerenes, you've probably never heard of M-Carbon, but this form of compressed graphite which is as hard as diamonds has baffled researcher for half a century. Over the past few years, many theoretical computations have suggested at least a dozen different crystal structures for this phase of carbon, but new experiments showed that only one crystal structure fits the data: M-carbon."
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Yale-Led Team Solves Half-Century Carbon-Crystal Mystery

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The solution of this problem is trivial and is left as an exercise for the reader.