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Diamond (carbon) is the hardest organic substance. Although carbon isn't, when it's compressed (underground, or in a volcano) it turns to diamond, which is the hardest substance. (plus, it's shiiny... @.@)

Diamonds are the hardest organic substance, measuring a 10 on the Mohs Scale of hardness, which is very high according to mineralogical terms.

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15y ago
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11y ago

Diamond is. (Note some recent work may indicate that Lonsdaleite a form of carbon closely related to diamond and extremely rare in nature and very hard to make may be harder. Some nano forms of boron nitride are apparently harder too)

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Q: What is the hardest inorganic substance?
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