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Rocks and Minerals

Can a mineral scratch any mineral harder than itself?


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November 25, 2008 11:33PM

Most of the time, no. But there are some minerals, such as kyanite, that have more than one hardness in an individual crystal. But this is an exception to the Mohs scale of mineral hardness, which is based on the premise that a mineral of a lower number cannot scratch a mineral of a higher (harder) number.