The hardest known substance is lonsdaleite, also called hexagonal diamond, according to a study published in Physical Review Letters and reported on Phys.org. Lonsdaleite is 58 percent stronger than diamond, which was pr... More »

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One of the softest commonly encountered metallic elements is lead, with a Mohs hardness of 1.5. One of the hardest metallic elements is tungsten, with a Mohs hardness of 7.5. The Mohs scale of hardness ranks materials ba... More »

The Mohs scale indicates the hardness of minerals by noting how scratch resistant they are. The test was developed in 1812 by the German mineralogist Friedrich Mohs. Diamond, the hardest known substance, is a 10 on the M... More »

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According to Chemistry About, examples of organic compounds include table sugar, methane and DNA, while inorganic compounds include table salt, diamond and carbon dioxide. Organic molecules and compounds are generally as... More »

Carbon naturally occurs in three forms: graphite, diamond and fullerenes. The most stable, and therefore most common, allotrope of carbon is graphite. Diamonds are less common, as the crystals form at a layer of the Eart... More »

As for 2014, the hardest material on earth is a diamond, a form of pure carbon. It ranks 10 on the Mohs hardness scale and has a rating of between 70 and 150 GPa, or gigapascals on the Vickers hardness scale. More »

The chemical formula for a diamond is simply C. Diamonds are carbon atoms arranged in a specific way. Graphite and soot also have chemical formulas of C because they are carbon atoms, like diamonds are, just in different... More »