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Diamond by far, is harder than steel.

Steel is an alloy of constituents being iron and carbon as the major ingredients. It is hard due to the interaction between iron and carbon molecules which causes them to stay binded together giving strength.

Diamond, on the other hand, is solely made up of carbon (diamond is an allotrope of carbon). The attracting force and the perfect stable geometry gives carbon a lot of strength, making it the hardest natural substance ever known.

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14y ago

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