Diamond

A crystal made up of 99.95% pure carbon atoms arranged in an isometric, or cubic, crystal arrangement. It is this unique arrangement of the carbon atoms that makes diamond look and behave differently from other pure carbon minerals such as graphite (the soft black material used to make pencils). There is no material harder than diamond. This means that it can only be scratched with another diamond. For as far as we know diamond is the hardest mineral found in nature and that is why it gets the maximum rating of 10 on Mohs scale of mineral hardness.

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