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Use the Accompanying Figure of the Mohs Scale of Hardness

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   Use the accompanying figure of the Mohs scale of hardness to answer this question. If you have a mineral sample that is capable of scratching a penny but is scratched by a wire nail, its hardness must be ________.
Use the accompanying figure of the Mohs scale of hardness to answer this question. If you have a mineral sample that is capable of scratching a penny but is scratched by a wire nail, its hardness must be ________.

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between 3.5 and 4.5 ...

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