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Describe how you can use your fingernail, a copper penny, and a steel knife blade to estimate the hardness of a mineral.
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Describe how you can use your fingernail, a copper penny, and a steel knife blade to estimate the hardness of a mineral.

User Joseym
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According to the Mohs scale of mineral hardness, your fingernail has a hardness of about 2.5, a copper penny of about 5.0, and a steel knife blade of about 6.5.(hope this helps!)
User Teodora
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